The problem with banning certain subjects is that it just fuels the fire to discuss them.
Many forums have a "Political" and/or "Anything Goes" sections to contain this kind of thing. I enjoy going in those as the conversations are most times lively and certainly have a great number of participants.
Everyone needs to be less concerned with what others are doing. If someone wants to have a nasty, hateful, controversial conversation in a thread, so what? Don't go in those places if you have a thin skin. Short of things that are crimes, I say just let it go.
Often times I write in a conversational style without alot of fretting about word choices. I just assume most people do the same thing. You just have to glean out what the person is trying to say and not go into a tailspin over their word choices, or how someone may perceive something "the wrong way".