In a society where access to everything from justice to healthcare is wealth-driven, being rich will always be a stronger identity than any other. He might be gay, but he's rich and gay, which means he is not effected by essentially any anti-gay policy you could reasonably pass in the US. Even if being gay was banned, nobody is coming for the billionaires or their lovers anytime soon!

If you assume that his primary motivation is the acquisition of wealth and power, and that that gives him much more freedom than any gay rights bill could, it makes more sense. Of course it also makes him a prick.

To really hammer this point home, read the story of Sarah Rector, a black girl who had come across such extreme oil wealth that the town legally declared her white.