Well, if we go by Twitter, it is a stereotype, though as stereotypes they can be wrong, such as when someone recently on Twitter tweeted before the Id of the perp was made public said, another white male (about a mass shooting). Unfortunately? for her and her retweeters, that ended up being wrong.

Also it's the stereotype for serial killers. So, what, now they can't mention if they guy was white because it's a negative stereotype?