It's not bigotry at all; it's just the logical conclusion from a set of premises. If Silicon Valley is provably the best place for a technology startup to be, then the people who want their companies to succeed the most will go there. The factors you mention are things that affect one's motivation to do anything it takes to succeed. No one is saying people who don't move to Silicon Valley are untalented. The comment you replied to specifically said that, so I don't see how the talent issue was brought back up.