In my opinion, bad taste joke would go along the lines "Disabled kid enters a pub and...". But he targeted one specific kid, so apart from being it a joke, it could also be an insult or other offense. (I am not lawyer, though).
Could we even have meaningful political dialog if, for example, it was illegal to intentionally offend Donald Trump or Hillary Clinton?
The idea of a right to not be insulted has scary implications.
That's actually exactly what Citizens United was about … a group of people were trying to show a film critical of Mrs. Clinton, and the federal government attempted to punish them for it. That's why there was a big push in 2014 to repeal the First Amendment: politicians wanted to make it illegal to oppose politicians.
Luckily they're not doing that. They're waiting for the offence to cause harm, and then they step in.