Well, we're not necessarily talking about the law here, I don't think it should be illegal to say it either, however in terms of this site I believe that a certain amount of effort should be taken to make sure that this is a welcoming place for people with special needs.
And I would hope those steps are nothing more than people quoting said person and saying "WTF dude" "you're horrible" "grow up" "ect."
I'd rather be on a place that has people not say or do something because they are good people than because we banned all people that are dicks. It's like the free market. If a cake maker don't want toback cakes for gay people. They go out of business by losing customers, not because the government forced them to shut down.
THat's my two cents anyway.