When I was in my mid-20's, I stood as the only passenger in the F Check-In line while the desk staff ignored me, beckoning for the next Y passenger over and over. I took it in good humor without an ego, knowing I'd be seen eventually. Then a manager came out and looked quite concerned that no one had even acknowledged me.

Once onboard, I was treated quite well though, and on dis-embarking had two of the crew ask if I was in "that band". (Nope - I'm a finance guy, FYI).