Peter Thiel - "People here don't accept conservative ideas"
Commentor - "I love diversity, but get the hell out with those opinions!"
...
Obviously there are some opinions I find abhorrent and wouldn't want to be associated with (Nazis, etc). However, I think both that I'm more tolerant of offensive opinions than the commentor, and that I also find really nothing very offensive about what I've read about Thiel.
Thiel doesn't seem that far right to me, and has been ostracized. But is any thought too far-left to be accepted in SV? You can support Venezuelan policies, Cuban policies, taxing rich people 90%, racism against whites and asians... and no one's trying to kick them out of civil society.
Yes, I think it's socially ok to criticize the extreme left (all my examples were extreme left positions).
I do not think it's socially ok in SV to be more than a little conservative. After all, companies Thiel was associated with were pressured to kick him out just for the fact that he supported a candidate that was voted for by ~50% of the country! Maybe that's because of Trump's other non-political characteristics, but I'm not so sure.