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Kramer made a major mistake, one of the worst a comedian can make: he wasn't funny. Add to that he offended some of his audience, and he's now got less fans who are willing to spend money to see his act. I don't know what was going on in his mind, but what he did was both offensive and stupid.
Maybe in his personal life he's a sweet guy, I don't know. If I had to make a choice, I'd choose to avoid him.
I for one would love to hear Jay Leno's reaction to that unfortunate performance. Leno--who has continued to do stand-up comedy even after taking his current Tonight Show gig--would be stunned at how Richards totally lost control of that stand-up comedy performance.
Call him Borat and thousands of FReepers would defend his racist "schtick".