Is Donald Trump homophobic?

First of all, I'm bisexual so this issue is of particular importance to me.

I voted for Trump because, while he was a horrible candidate, he was clearly better than Clinton. One of the criticisms I've heard is that he's homophobic and anti-LGBT, but I have no idea where this comes from. Trump supported gay marriage a lot earlier than Clinton did, and he seems to be good friends with America's second richest LGBT person, Peter Thiel, who donated a million dollars to his campaign. I've heard him say mean things about a lot of people, but never on the basis of sexual orientation.

Where does the assertion that Trump is homophobic come from?
Is Donald Trump homophobic?
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