Why do some men stare from afar with a creepy smile?

im Talking about strangers who do this. I was walking out of the cafeteria today and when I looked behind me quickly I saw a guy at the other end of the room with a creepy stare and smile in my direction. Why? I also think I heard a cafeteria lady talking about me to her colleagues but I’m not very sure since they were not talking in my native language

Why do some men stare from afar with a creepy smile?
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