What's the similarity between parents and a pizza? When they're black you won't have anything to eat
Are you trying to say that black parents can't provide food for their children?
Yeah, but it's just a joke, you stupid idiot.
It may be a joke, but it's still bigoted. Black parents are just as capable of feeding their children as any other parents. This joke can perpetuate harmful stereotypes, so I think you should consider not saying it anymore.