Freedom of expression explicitly means protection for ideas you find objectionable. It's sad, but a true consequence of that debacle. The person who initiated the campaign lost all credibility on the net, and told me that when he passed people in the halls of his own site, they all glared at him. They must make some connection in their own minds. This is the function of the stereotype in comedy, and sometimes it can't be replaced.
Comedians often write jokes that use stereotypes with no malice.
They are simply tools, like the fact that Dan Quayle is reputed to be dumb. Not everybody's as educated as you. Some of these jokes really promote hatred out there, and the net isn't perfect either. I can simply say that I have made the judgement that the net experiment is worth that risk, because I have determined that the level of such nasty sentiments is low. This matter is certainly a concern, but the other matters above are more important.