Here's what's being promoted by one of Nick Denton's GawkerMedia websites:
Have I noticed that white dudes keep mass murdering people? No, I've noticed that when there is a rare crime comitted by a "White Dude" it's massively promoted in the media. Crimes of the same kind, committed by blacks or Asian and Hispanic immigrants, do not receive this promotion.
This applies to black serial killers:
| Maurice Clemons +5 victims
|| Charles Lee Thornton +8 victims
| Colin Ferguson +25 victims
|| Clifton McCree +5 victims
| Hastings Arthur Wise +7 victims
||William D. Baker + 9 victims
| Omar Thornton + 11 victims
|| Nathan Dunlap +4 victims
Included by Mother Jones: pictures of 16 white people, one with orange hair, and one posed in front of a swastika.
The guy backed by a swastika is Wade Michael Page, the Sikh Temple shooter.  He's notable because he's the only white shooter apparently motivated by racism.
Every other white shooter on the list was motivated by something else.
Black shooters who definitely gave race as their motive.
Notably, Omar Thornton's victims were investigated posthumously by the media and by the Manchester Police to see if they were racist—as he claimed before murdering them. They were posthumously cleared .
Even more notably, Colin Ferguson, an immigrant from Jamaica, tried to use his racial motive as a defense in his trial. He called it the "Black Rage"  defense.
So yes, Gawker Media, we have noticed something. But it was something you didn't want us to notice.