I don't think that there is any way to get away away from the negative stuff. People say what they are going to say on the internet, just as they do live and in-person.

And also, some people will be upset by something that others might find amusing, and one person might get upset where the next one doesn't even know what was said.

The last thing is that even though they complain, people read and post to the threads that have gotten very heated.