So why DO guys say the most stupid things sometimes!?!

I once received a compliment from a guy in which he asked if I ever had braces. I said yes, and he said enthusiastically "Well, you do have really straight teeth!" I had to laugh, and it was then he revamped it saying, I had a beautiful smile. Seriously, tho... WHY!?
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COME ON GUYS, CAN I HAVE SOME MALE ADVICE HERE!?!?!?
So why DO guys say the most stupid things sometimes!?!
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