I reject the racial explanation too. I had the same problem as a white male. I went to a small private school in the Midwest; I had no full-time related work experience at the time (despite part-time jobs and internships throughout college); and I applied without an address in Silicon Valley. I sent out a hundred or so job apps, didn't hear back from most, got one or two flyouts. Eventually found a position outside of Silicon Valley.

That said, this isn't intended to be mean. I'm not sure how people would judge my achievements if my skin color were different. I think it would be difficult to tell whether a perceived mistreatment is racially motivated, or just a normal occurrence given the circumstances.