What you say appears true and, I have never understood it.
Well, not understood how it has persisted.
I must be missing something - because when I see or meet Jews, of which, I have certainly met, both personally, via friendship, family, business and going about normal daily life, probably quite a lot --
they aren't fat, they aren't black, they don't speak funny, the only times I have had business dealings - they have been honest, clear, straightup and very accurate, they are fun, they like music and they seem to be ok with jokes
the only thing I see that's different is that they will talk the legs off a table and some of the blokes wear funny little black hats - which, appear to me to have no practical purpose whatsoever except for hiding one of those funny hair parts that some middle aged blokes get -
that's it -- that's the sum total of racial funniness I see