Why would a guy jokingly say to me “dont look too pretty” and when I asked him why he goes “because men will want to talk to you”?

We are just friends, not very close but we were planning on going to a very fancy/nightlife type of place.

Why would a guy jokingly say to me “dont look too pretty” and when I asked him why he goes “because men will want to talk to you”?
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