My girlfriend told me all girls are sluts? Is that a red flag?

My girlfriend told me all girls are sluts and that most of them cheat. This kinda makes me wonder about her. Is she making up excuses because thats what she does? Another things that concerns me is that her friends are males. She knows how much I hate that, but tells me im insecure!
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My girlfriend told me all girls are sluts? Is that a red flag?
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