Why do guys stare at your shoes?

he was sitting infront of me at the other side of class, he kept on staring at my shoes. it weirded me out and I thought maybe he's acting like he isn't looking at me he stared at my shoes for instead it was weird. I left the class and he kept on staring at me.
I was wearing nike air max 97 black and white.
Why do guys stare at your shoes?
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