Lol! I love metal. To be honest I pretty much listen to only metal in my free time. I do believe that commercial crappy pop music that they are doing today is total garbage, but I can listen to it and at times even enjoy it when I'm going out at clubs or where ever they are playing it. I do have have a few leather wristbands and a leather coat and alot of black shirt. But I don't always wear black, have long hair. So I'm not sure If I'm true die hard 100% metal head, but I'm pretty close. I'm a moderated metal head lol.

That being said, your comparison is so funny, I've never looked at things this way but I think you are kinda right. We do hate commercial pop music. But we don't completly hate what's popular tho. We hate seeing a band selling out, changing their sound for a big corporation to try to get a wider appeal. I believe this is what happened to bands like Inflame or Within Temptation, I can stand it and still think they are really good but alot hate them now cause they ''sold out'' but they never became really popular (by that I mean Miley Cirus or One Direction popular). Meanwhile bands like Metalica are extremely well known and popular but no one feel like they changed their sound and sold out to get to this point, so metal heads love them. They are extremely talented and metal heads can give credits where it's due despite it being popular, same thing can be said for older bands like Ac/DC or Led Zeppelin. So the popularity is'nt really what motivates what metalheads think, it's more the perception of selling out or the feeling of a band/singer being just untalented (you know... those that have their voice changed with a computer, does'nt play a instrument or have dozens of ppl working for them to write their music for them etc...)

sounds like you need this guy 

I whole-heartedy believed that and I've been saying that during my metal phase, too.

The question is WHY don't like how today's pop music sounds. What is the underlying mental cause of this? You're the last person who would know. Few try to get to the bottom of this.

Insult? Compare. If that comparison is an insult to you... Well...

Hipsters are the people going around calling other people "hipster".

Not all metal heads dress the same. I listen to a lot of metal and metal sub genres i don't wear spikes or any kind of jewelry, I also wear clothes with colors. Also not all Metal heads hate everything that popular. You watch too many movies.

Not being mainstream certainly is not the only requirement for something.

I dont like metal at all and If I would be a hipster  not liking something  would still outweight the  "its not mainstream" aspect.  So I would keep not liking it.

Because its vapid and weightless. I tend to enjoy music that comes from musicians I can respect. I am a musician myself, played guitar for 11 years and drums for 5 and I can see the musical qualities in the bands I listen to. Some impress me with their amazing technical grasp over their instrument, or their creativity or their lyricism or the immense thought and time that goes into writing some of these pieces. Why would I listen to music that is repetitive and has no substance when I could listen to music by musicians who truly care about their work and actively try to better themselves as musicians?

I've done some decently detailed reviews when people have posted pop music on here giving my thoughts on a particular piece, vocalizing why I think it is garbage. If you have anything specific you would like me to pick apart, I will.

However, this isn't to say that I dislike anything due to its popularity. I really like "Take Me To Church" by Hozier which is one of the biggest hits right now, and you can hardly call bands such as Tool, Led Zeppelin and Chevelle "unpopular"...

You blatantly called metal heads egotistical, selfish and elitist...how is that not an insult?

that's one reason i almost never go to concerts and if so, i don't talk to people there.
i mostly hear black metal and i hate the whole scene, so i don't want to be part of it (even though i was a part of it while i had my underground black metal label some years ago).

i even don't wear bandshirts often because i hate how everybody looks what bands you are wearing and try to be your friend or hate you because of that. fucking antifashion-victims.

I read somwhere that whatever you liked in you teenage age, you mostly stick with it, because you activate some pleasure part of the brain when you listen to it (or something similar). Perhaps because you associate this familiar sound with when you were young (first love, best friends, first LANs, sharing a CD, whatever). Myself, I've never really liked any music without guitar, and it's not by elitism, I don't even think something like "the guitar is better than the didgeridoo and piano", that's just my feeling, I feel good with the sound of a guitar. On the contrary, I can like both Motorhead and Muse which are quite different, in term of style, period and voice... but have a guitar ! And that's not just for guitar, as different as they get, I tend to like music from the 70's. In fact, 3 of my favorite groups started exactly in 75 : Iron Maiden, Motorhead and the Sex Pistols. Sound of the 75 ? I can't even define it. Anyway, I live far away from my country... and I can tell you, I feel a similar relieve listening to my mother tongue... or listening to Rock.

Also, i feel that the music is less and less authentic, have less and less soul... nowadays it's just a product, and you feel it, based on the standard you set at the time where you started listening to music. I mean nowadays, someone produce the clip, someone else the text, music, you assemblate that with good looking people, put some money on the table and that's it. I mean the Beatles, Hendrix, Elvis Presley, it was mainstream, it sold a lot, but there is something pure in it. So, even if I listen to metal, I always felt it was not as authentic as the punk I grew up with. It's not elitism, I don't want to prove anything, but that's a feeling we get, perhaps.

As for the OP's question, I don't think music taste can relate to hipsters, it's something less wide, it's about music, but it's deeper, you can't just like other music out of openness.