Windup artists or trolls are quite commonplace. Some are actually quite good public speakers, some do provide your odd bits of humour, some perhaps just a bit assinine. But once the swearing gets out of hand, or phrases such as 'chink be gone' get thrown around, I reckon it's a bit overboard.
Really, I can't think of anyone who would find humour with crap like that, as it's a bit past winding up, thin or thick skinned. That's unless if you find racism funny...