it's certainly true that the tech enclaves lead to the techo chamber of liberalism. (fwiw, i am liberal).
however, this belies the point that led to many citizens relocating to these areas to begin with: the quality of life is better and the people aren't as closed-minded.
i am from the US South and grew up with extreme racism and intolerance.
there are still people in this country that think it would be OK to lynch me. that doesn't happen in the city where i live in California.