What do you call two black people in a sleeping bag? A Twix
I think that joke is very harmful towards black people.
You could call it that, but I'm saying it's a joke. Try to understand the true intent of this statement.
Your joke kinda implies that black people are dirty. No one likes dirty so it also suggests that no one likes blacks. This is ultimately harmful to our inclusive society so maybe change the joke a bit?
But isn't the statement still true though?
The statement is not always true like the way you are saying it. To assume that someone is dirty just because they are african american is an inconsiderate stereotype. You should not judge an entire group of people based on the actions of a few.