why does heith miller always get boos?

Hi everyone as a football fan and for those that watch football I'd like to know why heith miller (pittsburg steelers tight end) always get boos after catching the ball "like he's some sort ot terrorist" and he's the best tight end they have in the roster I don't get it!!! I've been searching google lately out of curiosity but nothing relevent...Well for quite some times now I think he's use to it.