I met Clarkson at the Nuburgring when he did the S Type Jaguar piece and if I remember correctly, in a quiet moment away from the camera's and talking to a group of us who were there on bikes, he's a bit of a closet biker himself - I think he even owned up to having a RD250 when he was young.
Like someone else said, his TV persona is an act. In real life and away from the camera's, he seems like an ordinary bloke - in fact, when we standing alone, by the Jag, smoking, between some filming, he seemed as lonely and out of place as any normal person might be in the same situation and he seemed genuinely glad when we spoke to him.
We also got to do some messing with them when they were out in the public sessions, which was fun (but man, was he slow in that car).
Back on the PC/racism topic, some of our closest friends are of Indian descent, and I have aMalaysian brother in law, Honduran and Chinese sisters in law, a very close group Mexican friends and one of my oldest friends is from Ghana. Yet, when we're together we always have jokes about ethnicity, every way and it's all done and taken in the fun manner in which is was meant - friendly and with no intent to "abuse".
In my, not so humble, opinion, racism CANNOT be identified by the words a person uses - only by the manner and intent in which they are used - and RACISM works both ways. When was the last time we heard of a White English person suffering from racial abuse, or suffering a "racist" (or hate-crime) attack ?
The PC community need to get real and let everyone get on with their lives.