When I was growing up, we only had a NES with the Mario/Duck Hunt game... for twelve years.
We would rent games like Ninja Turtles, Bubble Bobble, Trog, Double Dragon, what have you... but most Nintendo brands outside Mario were completely unknown to us, because if the little Mom and Pop rental store down the way didn't carry them, they didn't exist.
Our neighbor had a SEGA Genesis and then a Playstation, our aunt a Gameboy with Tetris, and of course arcade machines were still a thing you could enjoy in many public places, and eventually we got a home PC so I did play stuff that wasn't Oregon Trail and Carmen Sandiego, but to get to my overall point, I very much loved video games whenever and wherever I could play them, and I wasn't a fanboy of any brand or genre in particular. It was just games... games were so cool!
But some kids at school sure were fanboys. And as the internet became more well-trodden it was nothing but hotbed console warring on gaming topics. Real fun to read about when you can't even afford any of them in the first place lol.
Really though, it did used to bug me to read/hear these brand loyalty narratives because so many people would just dismiss entire swaths of gaming right off the bat and usually the person they were talking to in the same breath. "Eh, that's a 2D game... why would you want to play that?" "Wow, that game is for babies!" "What is this some Japanimation thing?" "Movie tie-ins are all hot garbage." "You like that game? That's a game for little girls what are you a @#$%?"
Well yeah, I am a @#$%, but more importantly, I just wanted to share about a game I thought looked really neat.
Some of that attitude has never gone away unfortunately and as folks have pointed out, it never will. Getting older you just start to filter these intentionally negative and dismissive people out. But I do understand the brain doing what it wants to and that sometimes you can't help dwelling on things you know are silly and don't matter and shouldn't bother you but do.
Luckily Famiboards is full of people who like all sorts of games whether indie, AAA, new, old, Nintendo or otherwise, so hopefully you don't encounter that energy too much here.