Pet Peeve-addressing women as "Girls"

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I get annoyed when I open an email, text etc and the writer starts off with "Hey Ladies!" or "Hey girls!" 
Why do we feel the need (as a society) to point out that all the recipients of our text are women? Men don't start off their group texts with "Hey Gentlemen/Boys". 
It just seems strange to me, lol. Is this a pet peeve of anyone else?

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