I do not disagree with you. 25 year old white male libertarians from Stanford (or earnest 28 year old hippies) is a more likely description. Merely staying with the example given by the OP.

For that matter, I wouldn't want to be in a company of progressive women only, either. Any monoculture is a bad idea. I'm happy to have friends and colleagues who span the spectrum, thankfully.

Given the massive downvoting the comment got, that doesn't seem to be a concept that the HN crowd agrees with. I'm not surprised about that, either.