What's the difference between a black person and a dog turd? Eventually the dog turd turns white and stops stinking.
This is a pretty rude thing to say.
That they are more likely to have disease because of their dirty lifestyle.
Comparing black people to a turd in this way is pretty messed up. Also, inferring that black people smell bad is ignorant as well since anyone can smell bad. Just a very disrespectful joke in general that makes you seem like you have a problem with african americans.