I think the main forums on there are really argumentative. Even for a simple question such as asking for an opinion I've had people hit disagree without commenting, which is confusing as it wasn't an appropriate response. I can't remember what the question was, but something like: "do you think this would look better in blue or green?". I think there are plenty of trolls out there to cause hassle. In the groups I've joined there haven't been any issues, and sometimes when I've read something to be offensive I've gone away and thought about the context in which it was posted and realised I had misinterpreted the response.