Because a lot of people ARE a bunch of dads coming from work and finding the first thing to complain about. The average age of the enthusiast gamer is probably up in the 30s at this point.
It's bound to get worse as we all get older. Imagine when 70% of people on this forum are having a midlife crisis, hate their life decisions, can't get their organs to obey them, can't keep their family happy, gaming ends up increasing their anxiety even more, nothing clicks and they have a co-dependent relationship with this forum where ranting to strangers about meaningless shit is their only fucking escape from what seems like an endless spiral, like that goddamn level in Silent hill 2 where you keep jumping deeper and deeper into the depths of hell and sticking your hand in every goddamn filthy hole, hoping and praying to grab a golden key that will magically make all the pain go away. But instead, out comes this helpless girl named Grace, who can't do shit but yelp and shudder and slip on blood, while fumbling around in the dark looking for fuses and screwdrivers that for some reason are never where they are supposed to be… and her dead mom is out to bite her head off in the middle of the night,…and I'm supposed to protect her?! On top of that, I need to decide if she constantly repeats "uh huh huh huh huh. Uh huh huh huh huh. Mh fm fm fmmm hmm" in first or third person?!! "Fuck that. Please give me a badass that I'll never be, who can solve all my problems with a mothafuckin' rocket launcher!" is what I imagine my 50 year old self will say.