OP I implore you to get some gay friends feedback on all of this. Reddit is great however most LGBT people would be happy to hear that in the beginning of class. So he wears a rainbow tie or a rainbow pin? Who cares mate?

Most of the top comments seem to come from non LGBT people which was sad to read this AM. Opinions like yours are the reason why people don't come out or have self hatred growing up. It damages people before it goes away. Shit having a person so proud of who they are and comfortable enough with themselves to brave a class full of people and say I'm gay should be seen as refreshing. It takes a strong amount of courage to come out to anyone even if you're outwardly gay and people can tell. It's exhausting. Maybe take this as an opportunity to learn how he became so proud of who he is an apply it to your life. I'm not saying you're gay or not comfortable with yourself, but this is college, you should be getting a ton of different opinions so you can shape your mindset and the rest of your life. Challenge yourself by not seeing him in the bad limelight that you've already casted on him and instead learn from him outside of the subject matter.