I do think there are many mainstream liberals who think it's ridiculous, but they're getting shoved deeper into the closet for fear of being shouted down.
These privilege/hate speech things are an instrument for thought suppression, IMO. And they're getting more and more frequent. The privilege movement is gaining strength. With twitter and Facebook and anonymous Youtube comments, there's an explosion in material to be upset about because there will always be morons posting dumb shit anonymously or semi-anonymously on the internet, and with Twitter and Facebook and Gawker, there's a growing platform on which to spread the new gospel.