There are people that are pretty "vitriolic" and harmful to a particular environment, whether they do it on purpose, or not. Personally I have so much online experience (from 90's BBS mailing lists to forums on the internet later, etc etc) that nothing phases me to the point where I can say that "I'm frustrated". I've seen them all, so to speak. The only thing that comes remotely close to getting emotionally affected is when I've invested a lot of time in a forum and it devolves into something weird, or shuts down entirely. Characters not so much. I kind of developed immunity to all their bullshit.