Ok the joke is not even funny, but remember there have been lots and lots of white slaves, Irish slaves, so why should the black people think its about them.
Two Irish men walking on a sea shore, one says "look a dead seagull, the other look up to the sky and says "I dont see it"
This joke is about the same level but noone cares because its about the Irish.

https://www.independent.co.uk/....news/world/americas/