Weird question

I'm bi and recently started working in the retail industry. Every now and then I will see guys that I definitely think are gay. Usually they have some slightly feminine traits and sometimes seem a little too nice to me. It feels very different from other customers I interact with.Is there a chance my instincts are right, or is there actually no real telling with people unless you talk with them? Please ignore my username as I often make new accounts and I made this one a few weeks back.