Why do strangers think it’s appropriate to comment on someone’s looks?

I meet strangers who usually tell me that I look sexy or beautiful etc… why do people think it’s appropriate to comment on someone’s looks. Like how is one supposed to reply,,, I only walk by them and don’t say anything most of the time or just say thanks… but is it not highly inappropriate to tell someone they look sexy.

Why do strangers think it’s appropriate to comment on someone’s looks?
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