One difference I noticed:

-There are PlayStation, Switch (or whatever Nintendo names their console) and Xbox fans.

-There are Sony and Nintendo fans.

-I haven't really seen any Microsoft fans.

the thing is, shooters are endless
rpgs are finite

thus xbox gamers are never done

Why did you laugh ?

I have around 30 games on the Switch, and 1st Party-wise I have only 5 games (Odyssey, MK8, Super Mario Party, Smash and Pokémon Let's Go Evee).

I played (and discovered) most of the Bethesda games on it (Skyrim, Doom, Wolfenstein II, Youngblood, upcoming Doom Eternal, Doom 1, Doom 3) and also other big releases (such as Witcher 3, L.A Noire, Grid, DBFighterZ, Sonic Mania, South Park 1 and 2, Ori, Rocket League, Okami, Crash Bandicoot Trilogy and Spyro Trilogy)

I guess Azzanation is MS fan.

What do you mean by Sony vs Playstation fans? Same for Switch vs Nintendo fans, I don't really understand the difference

Fans of their consoles vs fan of the company themselves. Like you may either like Sony as a whole or only playstation. You may like Nintendo or only this console (switch), but he thinks there isn't a fan for Microsoft as a company.

People like Sony and Nintendo as a company and the products they make. They defend their business decisions. They love the brand. Xbox fans love the machines but couldn't care less about other aspects of the company. 

Basically, Sony and Nintendo fans are loyal. They'll buy/defend them. They feel a personal investment with the company. Microsoft/Xbox "fans", from my point of view, are loyal to the machine.

Even me. I bought a few Xbox 360 consoles last gen. Thought it was one of the best consoles ever made. This gen started and I felt no desire to buy one until after I had everything else. Wound up buying 6 for myself and two as gifts. I'm still not really enthused about the Series X. They're going to have to win me over again.

I think part of that stems from their lack of franchises that I've formed an emotional attachment to. They have a handful but not as many compared to the competition.

Wow. Now see your comment. You nailed it.  Could have saved me a lot of typing!

It depends a lot on how many troublemakers are active.

For example, for a long time Nintendo discourse here was rendered somewhat toxic by multiple users I won't name who felt the need to invade almost every Nintendo thread to downplay and spread FUD.

Once those users were perma-banned, the air was cleared and the quality of discourse increased massively.

I imagine it works the same for other groups as well. It becomes less fun to talk about a system or games you like when certain people predictably poison every discussion about it. Again, thankfully our mod team has largely solved this problem on the Nintendo side of things, which is the one I personally can speak for.

In my 12 years on this site, i have seen the demographics change many times,I remember different points in time when Sony did well in the Polls and another where Xbox support was very vocal, same goes for the here and now with Nintendo.

The rise and fall seems to correlate with how well each platform is doing. You tend to get a  spike in the number of people from particular user bases leaving Vgchartz during these downturns the other feature of this is a decrease in activity by those who stay.

The size of the decrease can be magnified even more by the other half of the equation, the influx of members from those user bases on the rise and the added rise in activity