There are undeniably things about the presentation of a few of the characters, most obviously Remus, that are also closely tied to a lot of narratives about gay people.

That doesn't mean that they're definitively gay, and it certainly doesn't mean that JKR intended anything like that. But those things are there in the text - it's not projecting, or reading too much, or wishful thinking to notice the things that are there, and then how you choose to interpret those elements is your own choice.