When a stranger says hi to you?

I was walking down my street, and suddenly I hear someone from their apartment shouting that I was hot.
I ignored it and walked on.

But less then 2 seconds later, a guy I walk past, says "hey".
I ignored that too

But what did that second guy mean? Should I have said hi back? He must've heard those other guys calling me hot.

I am 16 and the guy definetely looked 10 years, or more, older than me
When a stranger says hi to you?
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