I've seen females get offended after finding out guys do that. personally, I see nothing wrong with it. the thing is a guy calls dibs and his friends understand he's into a certain woman/girl and they back off. whereas almost everytime I've told a female friend I was attracted to or liked a guy and I was planning to make a move on him she'd do so before I had a chance, even if it was a guy she made fun of before. which is why I no longer tell anyone
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This may sound douche, but i think its because women dont have the same brotherhood as men do. I find that women compete with women, where men co op with men.
I think this is because there is a general unspoken agreement between all men in a room saying that they (men) are at a disadvantage enough without being tripped up by each other.3