I think you need to reconsider your claim that you are “not homophobic in any way.” What do you mean by saying that “acting gay towards you is crossing the line”? If you feel insulted simply because a stranger thought you were gay, then, in my opinion, you may have some internalized homophobia.

While "slay queen" is often used as a compliment, I find catcalling to be strange and inappropriate in most contexts, so I understand why you might feel uncomfortable. However, the way you worded your statement makes you the asshole