If that were true, SeattlePioneer (SP) would have been banned years before he was. He was great on the home maintenance board, but on politics he could be pretty offensive about some issues. He was finally banned for posting what amounted to hate-speech, or so I'm told. I didn't see the post that ended him, so can't confirm. I was told by someone who says they did see it.

I know at least one liberal poster who was banned for being overly harsh with conservatives. He came back under a different name (you could tell by the writing style). I'm sure others did the same. Heck, maybe even SP changed this moniker. Dunno.

AF was my primary home there. We could be harsh if people just spouted, but if they had data they were treated with respect, and discussion ensued. Everyone was welcome there. We had some conservatives, some theists, at least one libertarian, a few gay persons...quite a mix.