For example: I was aggressively “anti-Nintendo” between May 2015 and January 2017. The reason being that (i) I didn’t like that Amiibo had distracted me from my Skylanders collecting (so I completely stopped purchasing all Amiibo effective immediately in August 2015; I had collected every single figurine up until that point), (ii) I felt that the Nintendo games of “today” (i.e. the Wii & Wii U years) represented a different Nintendo than of my early childhood (i.e. the GCN years), and (iii) I was 12yo in 2015 lol. I thought Switch was going to be colossal flop…until I watched the January 2017 presentation. It wasn’t even the gameplay, but the *music* of that Mario Odyssey that sent me through the roof. With all the FOMO surrounding the system’s launch, it was the last week of Feburary 2017 when I decided I would use my saved up YouTube earnings (I ran a YouTube channel during middle school) to purchase a Switch with Zelda at launch. Once I started playing Zelda, I was a changed man, and completely abandoned Skylanders, ending my rebellious phase.

Yeah there was a time when I was a dumbass kid where I'd shit on anything that wasn't Nintendo.
Eventually grew up and started gaming on PS/Xbox as well, ended up finding some of my favourite games there.

When I was 12 myself, I didn't have the kind of money you appeared to have.
Ei. those Amiibo are crazy expensive, even as the statusesk DLC they are.

At 12, I'd be begging my parents to buy me games for the snes :p
Back then there was no amiibo or nintendo toys like that.

Also odd that you think a "rebellious period" is stopping collecting every single Amiibo ever made by nintendo.
You must be one of the biggest fans out there.

I'm not sure it can exactly qualify as a rebellious phase, but going from my childhood of playing most of my time on Nintendo consoles (GBA, SNES, N64), to jumping on the Xbox360 during my preteen and teenagehood playing every type of games like annual sports releases and FPS COD shooter out there, only to go back to playing Nintendo handhelds once I could buy my own consoles ...

Feels like a wild rollercoaster lol

When I got into emulation some twenty years ago, there was kind of time when I was convinced that if people took effort to fan translate Japan-only titles, those must be the best games ever.

Those did include some real great games like Live A Live and Clock Tower on SNes and Wonderswan Color remake of Makai Toushi SaGa (Final Fantasy Legend) and some from my already favorite series like Phantasy Star Gaiden and Shining Force Gaiden 3 on Game Gear.

But I did have bit too much faith on that. Many titles were translated because it was relatively easy to do so or just because they were from some franchise. (I rather liked Ranma ½ RPG and love Tenchi Muyo! RPG, but there are many worse examples.)

I missed on a good chunk of Nintendo games throughout the early 2000s after I got my Xbox, playing on friends/cousins PS2s, and of course gaming on PC regularly.

My weird rebellious period in gaming has been going on since like the turn of the century. In the early-to-mid 2000s the biggest titles were like the original God of War and entries in the Grand Theft Auto franchise, whereas I found during this window of time that I was more into the likes of Ico, Eternal Darkness, Beyond Good & Evil, Shadow of the Colossus, Drill Dozer, Okami, and Chibi-Robo. This tradition of generally artsy offbeatness continues today, where my favorite games from this year so far are Silksong, Split Fiction, and Deltarune.

I would say mine was late 1990s and early 2000s when I was anti-playstation.

That changed of course when I got myself a PS2 back in 2003 and a PSP back in 2005.

I was a bit antagonistic not towards the company but the fans of Xbox and Nintendo mid 2000s.

Nowadays dont really care what dumb opinion or anything from anyone from any camp say.

I'm on all ecosystems of Nintendo, Playstation, Xbox, iOS and PC (Steam, GOG, EGS, etc), I see all the benefits each platform provide and I'm happy with it.

I hated Xbox when it first came out because I was convinced Microsoft would exploit the industry and then eventually ruin it. And while the hate ceased with age, the... wait.

As the Wii U was sinking (despite some good games), I was in a period from about mid 2014 to mid 2015 where I really thought Iwata, Reggie, and some others at NIntendo needed to go. Reggie might've needed to go, but I had no idea the next system would be awesome with the concept approved by Iwata.
I didn't become some Iwata fanboy or think he was amazing just because he died, but his death and in particular Switch made me appreciate him more. I also continued to learn about some of the awesome stuff he'd done throughout his career.