Think of it this way...

You're the only person on earth. Does your gender matter anymore? Hair colour or length? Cock or boob size? What you put on your face or wear? Whether you like sewing, math, fishing, dancing, or frolicking through a field? No one's there. You don't have an identity because you're never being identified by anyone. You're not goth, gay, feminine, trans, or Scottish—you don't know what those things are and actually never will because they won't be invented. I mean, you could invent them by some astronomically improbably chance, but how, why, and what for? They're all made up things along with all the socially expected tropes that come with those "identities".

So what you perceive as "gay" is just nothing for a lot of people. They wouldn't have considered it, nor would care, you'd be struggling to hold their attention as you tried to explain it and they'd forget it in moments anyway. These people say "I am me", not "I am a..."