Soooo, is that antisemitic ---- or just anti-semantic??!!?? ;-)

It is a joke and perhaps should always be best seen as a joke. It probably also depends on who is telling the joke.

But consider if your chap had been set-upon in his journey by a young black mugger - it would be thought by some to be reinforcing racial stereotypes and portraying young blacks in a negative fashion and be thought racist........

Unless the chap telling the joke was a young black mugger/comedian/rapper etc - then it may be OK.

It is very complicated.............