It seems to me that these concepts are totally foreign to the SF tech class, which seems to operate in what is perhaps believed to be a fully rational paradigm. But people aren't really that rational.
Peter Thiel very likely had a tough childhood, one that made him particularly sensitive to his sexuality. [E.g., not to go there but his vendetta against Gawker has no other explanation. Modern self-accepting gay men would probably say, "ok yeah um that was low but whatever."]
My evidence of him being self-hating is not from his political choices, but it's from everything else. It's from the way he speaks, his profound effort to be contrarian (I went through that phase), his peculiar vendetta against Gawker, and, to go there, his apparent lack of a stable partner. If there ever were a gay bachelor, it would be Peter Thiel -- but something is apparently wrong to make that an impossibility.
But in general, you might have to concede that your intuition on these issues is not as well developed here as that of a gay man's, who has seen these issues for many years on a deeply personal level.
I also find it ironic that something called Project Include is upset because someone is supporting a party that a huge percentage of the country is going to vote for. YC had nothing to do with Thiel's donation and you dissociate from them when there are 2 degrees of separation? That is not inclusion.