I'm talking about an extreme case here - a serial troller. Definitely nobody at PatsFans.
A guy that seemed to revel being the world's worst troller was outed, had death threats, lost his job (which his kids and diabetic wife depended on.) Played the victim in CNN. All he did was invest thousands of hours posting every kind of slur imaginable, encouraging posters to put up pictures of underage girls up their skirts without their permission.
http://gawker.com/5950981/unmasking-reddits-violentacrez-the-biggest-troll-on-the-web
At least 90% of what's wrong on the internet is spammers and trollers...they would not exist in a face-to-face environment - they would get killed. When I moderated in the past, often the IP, email, etc would blow their cover.
If someone is inconsiderate or cruel most of the time, eventually it's going to haunt them.