To be bluntly honest, I believe the majority of reflexive thought of straight men towards gays will always be of some sort of in-built revulsion. That majority may diminish as time goes on but I don’t think it will fall below 50% or so. Sexual orientation is pretty hard-wired, and people who say “ewww” when they see two men kissing were probably not taught to think of it as gross, it was instinctive.
That’s not the same thing as their political views - plenty of straight men will vote to support LGBT rights. But that’s “tolerance” - tolerating something you may not personally or naturally like.