Fencer should be able to run the site as he sees fit. If you don't like that a ban occurred then you can vote by not renewing your membership and
moving to another site that allows that behavior.

Edited to add this comment:
I personally glad the vulgar and crude comments are limited here and stopped when they get out of hand. I don't want to see it, I joined the CAVE fellowship and was offended a long time ago. I am not surprised it reached a level that it needed to be removed.