But it's not homophobic to present OJ as a lech. It might be untrue, but there are just as many lecherous gay men as straight ones. It can really taint the gay social scene for some men who don't want that, just as it does for some women.
Because there is a long history of demonising gay men as depraved sexual predators. It may not be a stereotype that you recognise or aware of, but that doesn't mean that the tired old trope is not offensive to gay men.
We are very much on the other side of that now though. Not only apparently can't we speak about gay men like any others, almost any type of odd sexual behaviour, simply by being associated vaguely with the queer community, is exempt from being called lecherous.
I don't think the lecherous gay man trope has much power these days, but making it so that gay men, even as individuals, have always to be presented as sexually moderate, isn't really much better in the end. It still stops short of treating people as themselves, as a variable group of individuals.