Why do men "have" to get into fights?

I realise that 90% of the reasons of people fight (usually guys) is for dumb arguements. The only reason I would feel the need to stand up is if someone messed with my girl or a family member. I got into a fight not too long ago because my cousin was a dumbass who apparently thinks getting mad over an argument justifies it (I didn't even started it; didn't once intend to land a punch).

So is there some good reasons a lot of guys feel there's actually a reason to? All I see is petty ego, not pride. I don't feel like I'd be defending anything meaningful.
Why do men "have" to get into fights?
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