I think there is a distinction between posters (and supporters) like you who are naturally pessimistic, downbeat and convey their anxieties as a coping mechanism, and those who are repeatedly vituperative to the players and/or the team, which is what the OP is plainly aimed at.
We’ve all been sat next to them at games - some of us regularly, lamentably. Screaming abuse at a particular player, or loudly vocalising their unhappiness more generally with the team to all of those around them. They have always been amongst us, but still endure to this day, despite our success.
In my view, they are utterly selfish cunts because they project their own neuroses and malcontent onto those around them, without any consideration for the fact that those people might just be there to watch the game and support the team without some angry **** screaming in their ear about what a waste of money Grealish is.
The same applies on here. Malign cunts trying to bring the general vibe down to their level by sucking the life out of others, because it makes them feel better about their own miserable existence.
So it’s not just people dealing with things ‘in their own way’. It’s cunts spoiling the party and stinking the place out without any consideration for those around them.