Seems people in general have started to project their lifes disappointments, stresses, and greater human needs onto a digital dimension like video games. Growing up they used to be about fun. I have endless memories as a child playing Mario N64 and it not needing to be about playing a particular way; only as a I got older and competition and disappointments being human as an adult added up did I notice this shift you mention in online game communities.
I like to ask now, "have you heard of playing for fun?" It's surprising how little people seem to remember that games are made for fun & learning ("play" as a human construct).
edit2: taking back this edit on political conjecture to say something shifted that I'm not sure what. edit: in online games I played growing up too, this negativity/anti-fun change came probably around 2004 with bigger changes in the US political climate as well.
Games have also become more like work, bloated Hollywood blockbuster budgets lead to endless busywork content that pad out playtime.
I don't know, I won a friendly Super Smash Bros tournament circa ~2011 with kirby spamming down b with what was it, the c-stick? Whatever it was where you could do the super move or whatever automatically instead of having to choose how much power you wanted and just generally clicking random buttons.
The friends who all played vastly more often than I did and had all their techniques and edge jumps and recoveries and stuff practiced were furious.
Lots of "you can't do that" "that's not fair" "that's not the way you're supposed to play" etc.
edit: oh, I see your edit. Yeah, it's definitely not new.
> edit: in online games I played growing up too, this negativity/anti-fun change came probably around 2004 with bigger changes in the US political climate as well.
Tying this to politics is odd to me.
Online gaming has been toxic since day one. Anything that depersonalizes is going to be toxic and that is inherent in the online space. In the smaller communities you can actually get to know people and have some kind of reputation but as the community size grows, the consequences of bad behavior fade because nobody can remember.