Ask HN: Why are Bay Area CS students unprofessional?

I've been working with CS students from across the country for the past month. I've found that Bay Area colleges like Stanford and Berkeley students have been rude, unhelpful, sarcastic and unpleasant to work with, but if I speak with students from UCLA, MIT, Harvard, CMU, Purdue or farther away from the Bay students are nicer and much more professional ie, follow up with emails and say what they are going to do.

Is it because tech companies spam them everyday and they think they can get away with being unprofessional because they think they're better? That can't be it, can it?

I've also see patterns with CalTech and UW, CalTech I understand, they are too busy to do anything else, but UW, is it because they are just bombarded by Microsoft?