Kramer went nuts and was not joking, and even apologized.
Foxx is obviously joking, but it's not obvious to morons.
And you know him so intimately that you can speak for him. Joke or no joke people get offended. If I teased a black person about eating watermeleon and or fried chicken and then said I was joking, you think some would be any less offended? Harmless on the surface. Not so harmless to those on the receiving end.
It doesnt matter if people get offended, who gives a fuck. Funny people aren't in the business of not offending, and especially if theyre joking. Grow up.