That's what he claimed.

I'm not seeing any hard evidence.

What, do you need the slurs carved into his skin with the knife??

Why would you "jump" someone but not take anything, unless you were just wanting to beat him up because you didn't like something about him?

Slurs carved in the skin would probably constitute "hard" evidence. But evidence definitely falls on a range. Not all gay people who are attacked are victims due to their orientation. We need more evidence to know.