Gosh, I do get bored with the constant unenlightened trottings-out of 'freedom of speech'.
We don't have unlimited freedom of expression in this country. Speech that incites racial and religious hatred is criminal, for example. I think the same should apply to hate speech against the disabled personally, because we increasingly see that they are taking the brunt of the mob's apparent need for victims. If you use hate speech in the course of another crime e.g. assault, it aggravates the offence.
If you criticise a person for something he or she has said, you are not infringing their freedom of speech, you are exercising your own. There is nothing wrong with posters saying of FB that while he is and should be free to say what he wants, many of the things he has chosen to say are immoral, wrong, dangerous, offensive, or whatever.
That does not add up to a world in which people are afraid to say anything in case someone is offended (though caring about whether you gratuitously cause offence to others is just being a grown-up, in my book, hardly equivalent to living in some kind of Stalinist gulag).
And telling a hard-hitting, controversial joke doesn't automatically mean that the comedian is bravely using satire to highlight society's prejudices. He might just be exploiting hatreds for cheap laughs.
Which is not to say I disagree with the verdict. I never though FB was a racist, but I do see the irony of a comedian who accepts no restraints or boundaries imposing them on someone else.