I am someone that basically trolls around for fun when I have open time, usually on the politics section for the last year.
I have seen FDD ban a few people, and have been close to it I am sure at some point my self because it can get very heated over in it when discussing stuff like abortion rights, but there is zero question that he lets a whole lot slide. So if you get banned by FDD chances are you should have been a while ago and it was just the proverbial straw that broke the camels back. But at the same time, I have seen people that have been banned welcomed back. Because they do contribute and don't just insult people all the time.
You should have no worries about this being some 'dixie-cup' site, they do a good job, and unless you think that you will be insulting everyone all the time with shit you know will get you banned if the person you are doing it to complains about it and you continue even after you are told to stop, or endangering the site by doing something illegal, chances are you won't get banned.