(I really hope it's okay to even talk about this. I would rather not get banned.)

My impression is that incivility and social obliviousness is really what gets to people. The couple people I've seen banned here over the past year or so, even though many people pointed to the non-PC content of their posts as the reason for the ban, I believe that was a misinterpretation. They were banned for being unlikeable and uncivil. Simple as that.

This mirrors my experience on almost any forum out there, except where systematic censorship exists for the benefit of a certain established agenda (like selling a product).