Why do we hate Jeff Gordon?

Let me start by saying that I am not a NASCAR fan. Jeff Gordon sang the seventh inning stretch last night during my beloved Cubs game and he was quickly overtaken with boos. Granted, he was terrible and he referred to Wrigley Field as Wrigley "stadium", a definite no.

Despite that, the boos were more because he was Jeff Gordon than because he botched the song.(remember the cheers that Ozzy got when he mumbled through it) Why do we love to hate Jeff Gordon? He seems to be a pretty stand-up guy...so what is the problem? Any insights?