Girlfriends male best friend calling her beautiful?

guys and girls please help. Me and my girlfriend disagree. Her and the male bestfriend have been friends for 2 1/2 almost 3 years. They were messaging on snap one day and he asked how are you she said eh shitty his response was smile beautiful. Now I asked her if he knew we were together and she said yes. The part we disagree on is if it's ok that a friend of the opposite sex calls your boyfriend handsome or your girlfriend beautiful. She says it was only a compliment and they are nice to hear once in a while (even with me calling her beautiful everyday) I say it's not a compliment it's flirting and it's not ok. What do you guys and girls think?

Yes it's ok
No its not!
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Girlfriends male best friend calling her beautiful?
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