Personally, I think you'd make better clearer progress if you rid your head
of the unhelpful concept of 'bad taste'..

Concentrate more on 'funny or not funny' and the pragmatics of what amuses diverse audiences..

eg fart, bum, and willy gags are universally funny, despite minority objection
from uptight individuals...

Racist gags are not at all funny if the comedian is fueled by hatred towards ethnic groups.
However the same jokes can be made funny when appropriated by the targeted victims,
or sympathetic progressive comedians,
and used to cruely parody racists...

Alf Garnett was comic genius...

To a lesser extent, the same case can be made to defend the much misunderstood series Curry and Chips..
Even at a bigger stretch Love Thy Neighbour...

Discuss...

[30 odd years ago I was half heartedly training to be a media studies teacher..
how differently life turned out...]