You are entitled to your opinion, and as a gay man I wish our society was more open to hearing the opinions of others without judgement (on any topic, including this one). I believe it’s better for people to have uncomfortable conversations with mutual respect rather than adopting an “us vs. them” mentality.

That being said, I encourage you to ask yourself why seeing people wearing pride flags makes you so angry. Generally, I find that when someone else’s behavior angers me, it’s usually because they are reminding me of something I don’t like within myself. It’s a projection. We are all mirrors for each other. I am not one of those people who think all people with homophobic thoughts are gay, that’s not what I’m saying. I’m just encouraging you to ask yourself what specifically is bothering you about them. Perhaps there’s a part of you that is jealous of the confidence. Or perhaps what you seem to be perceiving as an annoying need for validation from these people is triggering memories of your own needs not being met as a kid. And so on. IDK. These are just the types of questions I ask myself when someone else’s behavior bothers me.

And I’m not saying your viewpoint has no validity at all. Sometimes I feel like the LGBT movement has turned into a parody of what it once was, and there’s a lot of judgement within the community as well. But I understand the history of oppression of LGBT people which led to the movement, and how our deteriorating ability as a society to try to find common ground has led to both LGBT supporters and opponents to dig in their heels.

The fact that you posted this shows that you’re trying to understand yourself and your actions in the context of the situation, and whether there is room to improve. Honestly I don’t think the teacher is being helpful by threatening to essentially punish or shame whoever wrote the thing. You should feel safe to speak your mind, and you should also be open to new perspectives.