Why do some men get such a pack mentality when it comes to debating with women?

It seems like it doesn’t matter if half of them would typically agree, if you’re a woman and one of the men disagrees with you first… it’s like built on as some sort of bro code. Isn’t that kinda feminine to follow other men around like puppies?

Why do some men get such a pack mentality when it comes to debating with women?
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