I've done that as well. It's almost to the point where being in the chat is rarely fun. Gawd knows I'm the last person who would ever criticize anyone for being negative because over the past 15 years there have been plenty of things to be negative about regarding Nebraska football.
The negativity usually starts after our opponent gets a 1st down or strings together a couple first downs. It's like, holy sh**, we're still 7 minutes to go in the 1st Q and you're already saying we've lost the game. (Now in fairness, unfortunately, the last 8 years, those people have been right more times than they've been wrong.)
But yeah, rather than try and fight the negativity, I just leave.