is pumpkin a racist term?

there has been some debate over whether the term "pumpkin" is racist or offensive.

Bomber says
Dumb cops and a media dumbing down the story. Dumb, dumb, dumb.

Stil I have found that the term pumpkin seems pretty popular even in the chinese bulliten boards. At first glance I thought it might be bit offensive but it would seem those who should most be offended are not offended.