What I've noticed the most about SF are it's inhabitants being shocked (shocked!) to learn that people have views different than them. It's as if their entire world ends at the city limits.
You should remember that we're not all from the Bay Area.
For example many people in my workplace will genuinely call you racist if you say "employment decisions should not be made on the basis of race or gender." Threats of violence towards Trump voters varying degrees of subtlety are made on public channels with no apparent repercussions, and these were positively received by much of the company.
Are these views and behavior that you agree with? Sure most liberals probably agree with Bay area liberals on national issues, but that's just the tip of the iceberg.
I also dispute that people are free to be conservative in an "old" sense - whatever that is meant to mean. The majority of conservatives have and continue to believe in:
* Opposition to same sex marriage.
* Opposition to abortion.
* Support for more rigorous immigration enforcement.
* Oppose affirmative action.
Among other things. All of these things are things that would be socially unacceptable in much of the Bay Area, and employees are probably committing career suicide if they do espouse these views. Sure, people can rationalize this by saying that these political views are misogynistic or racist. But if a group constructs a definition of racism, homophobia, or misogyny that categorizes mainstream conservative views as such, then saying "you aren't allowed to be misogynistic or homophobic" is functionally the same thing as saying "you aren't allowed to be conservative."
All of these are traditionally conservative views. In fact today's conservatives are actually more accepting of gay marriage and other things than they were in the past, so I'm especially confused at what you meant by conservative "in the 'old' sense of the word."
There's a gun range in the Santa Cruz mountains that's about a 20 minute drive from downtown Mountain View where I've had just those types of conversations. I had a discussion on military budgets, with sailors, in a bar in SF months back during Fleet Week. I literally had a conversation about misogyny at the gym with my friend today, because for once we were outnumbered by women there.
I think SF is an ideological monoculture in that you aren't really allowed to be racist or misogynistic or homophobic here, sure. But you're certainly allowed to be conservative in the "old" sense of the word. Tons of the new rich here are.