There are many men like this. MANY. You attract them because you have breasts.

Just curious, are you gay? Because you're saying you don't know any men who behave like this but how would you know how men behave when hitting on someone unless you have been hit on by them as well? Do all these men you know treat all their male acquaintances the same as they treat their female acquaintances?

No? Then maybe we shouldn't assume hat just because someone is ok or "regular" around us, they are that way around everyone.