There's one moment that really stands out in my past that I regard as homophobic, and that I deeply regret.
There was this guy in my class who had made a video and was shaking his backside and carrying on like a total thot, and me and one of my male friends was discussing it and I very clearly remember making the comment, "That's so gay", and I totally meant it as an insult. If I could, I would take it back, but I'm glad to have grown from that. It's really amazing what being trapped in an anti-gay environment can do to your psyche, even when you suspect you might be gay yourself.
