[joshcohen]

One candidate has repeatedly been dishonest and suspected of corruption while in government previously (and honestly, the list goes on and on). If people don't take a stand against this type of thing, it is a tacit acceptance.

No it is not tacit acceptance. People weigh pros and cons of each candidate and make a choice. No donation or endorsement implies 100% allegiance, only an overall preference. I'm sure Thiel thinks Trump is fairly idiotic. "But he's a sexist" doesn't change anything even if it were true.

Anyone is free to shun people for their publicly stated political stance but any particular policies or personal attributes of Trump or anyone are not in a special category that is shun-worthy.