(This is a comment on the parent comment, not a comment on the original post. Hope that's alright.)
"You start to see that it is also a privilege to be able to argue, even vehemently, without inadvertently confirming a malignant stereotype about your heritage or upbringing."
Very well said. Thanks for articulating this idea. Don't forget that this goes both ways, though.
As a straight white male that grew up in a very progressive college town, with almost all of my friends being progressive socially liberal graduates, I am constantly "educated" on my privilege and dismissed, ala "there goes that (straight) white guy again with his white privilege and lack of understanding", simply for attempting civilized discourse that is anything but blindly supportive of their social and racial views.
I have to question a sociopolitical philosophy that leaves a lot of its followers avoiding dialogue with and dismissing the people who are most likely the closest to sharing their concerns and ideals.
What I'm trying to convey here is that not much attention is paid, particularly by those who otherwise like talking about privilege as a concept, to the privilege of being able to argue. As I believe civilized discourse is a bedrock of our society, this concerns me. "And it should concern you too!"
It's very important to not tarnish the movement with the actions of a few. It's frustrating to be dismissed for your race when trying to help things, but it's only a vocal few that do this. I hung out on an anti-racism board for a little while and learned a few things there about racism and also about activists. There were the horrid vocally abusive ones, who were given free reign on the board, free to spout their abuse of whites (the board moderator was white and allowed this out of a sense of 'recompense for past sins'), but most of those identifying as non-whites were normal humans trying to discuss things rather than spray venom. The thing is, if you let the vocal nasty people taint your opinion of those following the movement, you're falling into a trap again. It's a bit like tarnishing all baptists with the actions of the Westboro church.
The thing to remember is that the author is not promoting a manifesto or calling to action, he's venting. He's frustrated, and he's not creating a culture of oppression with the occasional use of 'dumbwhite' - some commentors in this thread seem to think that this private use of the word in an anonymised article makes it as bad as creating a culture of bigotry in the workplace. Racism isn't a binary on/off.