Why are men always telling women to smile?

Miss_Savanna_Dry
This is by far one of the most annoying things I've experienced. Male strangers tend to say:

“Why don’t you ever smile?”
“Just smile for me.”
“You’d look better if you smiled.”
“Smile sweetheart.”

I can't for the life of me understand why? Why would you feel the need to say that to a complete stranger? By the way I know this does not imply to all men, but most girls complain about this and even get angry when men do this.
Why are men always telling women to smile?
Why are men always telling women to smile?
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