Is it normal that men don't greet me?

I'm 29f, I live in a building where people tend to say hi in the elevators as a way of being polite. Its common to see mothers telling their children to always say hi or bye as they enter or leave the elevator. But I have noticed that only women or gay men or old grandpas who greet me. If he is a young man under 60, he won't say anything. He will just walk in pretending he doesn't see me. I don't know if this is something every other woman also experiences or is it just something about me that is unattractive?

Is it normal that men don't greet me?
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