I think the difference is between people who are looking to have constructive discussions versus people who are trying to troll or just vent online.
Some people just want to talk football and have a good time. That being said, people shouldn't be harassed for controversial opinions. I am very big on the fact that the general consensus, including on this message board, can be wrong on items.
Regarding trolling, if you want to do that, go join some video game thread with 12-year olds. You would be right at home. Reddit or 4chan might be a good fit.