Can you expand on this, explain the connection? In particular, why the former (belief) would influence the latter (behavior)?
I firmly believe, based on overwhelming evidence, that genetics makes most people perform terribly in technical roles. Fortunately, there are a few bright, above-average exceptions that perform amazingly. If someone proves they're competent, I'll treat them competently, but at the same time it doesn't make sense to assume that the average person could be anywhere near competent.
Edit: answer to your second question: I try to be inclusive, I don't believe in drawing lines, at least not when it comes to belief (only behavior).