Once I finally get a Series X, I'll have owned every major console from the past five generations except for the Saturn (it was discontinued several months before I got my first job). I have had my fair share of both praise and complaints about all of the current Big Three. Perhaps because I've always been a multiplatform person since the 16-bit days, I've never really understood how vociferous people get over their like of a particular brand and, frequently, dislike of other brands. I know where it comes from: the same part of the brain that all other forms of tribalism comes from. Still, why tie your own identity as a person to a particular brand of electronic toy? It's not something serious, like disagreements over matters of public policy.
I think a lot of it has to do with this:
Once I finally get a Series X, I'll have owned every major console from the past five generations except for the Saturn.
Not everyone has money to spend on getting every console under the sun. For starters, pretty much every kid or teenager that wants a console will have to ask their parents to buy them one, and the vast majority of parents won't buy more than one. Obviously, this stops being the case amidst adults, but inevitably you already have some brand loyalty forming in someone's childhood years - heck, the gaming marketplace was very much meant for kids during the 80's, 90's, and even a little into the 2000's. Games were seen as a kiddie thing, so you didn't have many adults to begin with.
Even ignoring that and taking it from the point where there are many adult gamers with jobs, there are a lot of people who don't make enough money to be spending so much on games. You can argue that if someone makes enough to buy one console, they can eventually buy another, but for most people it's just not worth it as it can be really redundant to own multiple consoles just for a few specific exclusives. This obviously also depends on where you live, I'm sure in somewhere like the United States there might be plenty of people who make enough money just fine but somewhere like here in Brazil it's extremely expensive to buy just one console and the vast majority of people wouldn't even entertain the idea of getting another.
And, yeah, if you can only get one console for financial reasons, it is still very much possible to not act like an idiot and take sides like the console brands are your football team. But I feel that's just how it is. Inaccessibility makes people want to disregard what they can't have, and for some this can escalate into idiocy. This is especially true if it's between kids at school, who love to take sides to argue about stupid things and bully the ones with unpopular opinions - and since most gamers in the 80's, 90's and even a bit into the 2000's were kids at school, well... there you have it.
Maybe I'm not looking in the right places, but as gaming lost its stigma of being a kids hobby over the past 15 years or so, I feel like console wars have become less and less relevant, to the point I rarely see anything of the sort nowadays.