For oldtimers, and by that I mean those who were around when this newsgroup was new,I'd like to rehash and old thesis of mine. I sincerely beleive that sometime in the fourth season the show's writers and producers came to the conclusion that political correctness was worse than predjudice. If my thesis is correct and I think that it is then that would explan the meanstreak that ran through several scrips in the years to come.
Now this doesn't explain why the actor who played Kramer did what he did but it puts some perspective on the intertwining of his show's character and his character. Nowwwwwwwwwwwwwwwww it seems that this actor(and others has an Anger Management problem. And when this flares up the acor or actors have a well of cultural resentments to mine. Homophobiaa in one actor,antisemitisim and in another actor or rascisim. in another. This fact undermines the steriotype of the Liberal Hollywood actor. The people in question seems to have a rash on their neck(red) which becomes inflamed whenever they have a bad day.