I quite agree, Airto. With accuracy and tactfully there's nothing wrong with them. People are insulted when there is an intent of insulting; and when there is an inaccuracy which is insulting in itself. "Didacoi" is perhaps a different matter from "gypsy" or "traveller" - in a way it's a word like "half-caste". I've never heard it used except when there is a hostile intent.

"What's black and blue and floats in the bay?" The last fella that told a Newfie joke in here..." I'd like to think that's based on a true incident. And there's versions of that for "Irish jokes" and "Polack jokes" and "Kerryman jokes" and the rest. But probably not for "moron jokes", which makes them a good bit worse than the others.