Is telling someone they would look prettier/handsome if they smiled, rude?

Randomawkwardness
Personally, everyone looks better when they smile. I don't know why people would be offended if they were told that. Maybe if it was in a creepy way but just in a normal conversation, I wouldn't mind.
Yes, don't do that.
Vote A
No, it's okay to do that.
Vote B
I don't care
Vote C
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GirlGuy
Is telling someone they would look prettier/handsome if they smiled, rude?
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