> SV culture claims to be inclusive and value diversity of thought

I don't see many people in SV culture claiming to value "diversity of thought". They value diversity of culture, races, sexual identities, etc. But not thought (unfortunately).

That said, other posters are 100% correct when they write that rural America is just as intolerant, only in the other direction. And you don't see many people moving to those areas and attacking their lack of thought diversity (probably because they'd get shunned, at best, or shot, at worst).