Why do people insist men & women can't just be friends?

Seriously it's one of the stupidest things I've heard. I mean how do you explain work colleagues that are friends because they've worked together for years. Or men & women who grew up together as childhood friends. You gotta be stupid not to realize that friendships like these are platonic. I mean I've a male friend I've known since 3 and he's a brother in everything but blood.

Or are people who say men and women can't just be friends more promiscuous, than the rest of society and lack the ethical and moral abilities to understand it's more than possible to just be friends.

Why do people insist men & women can't just be friends?
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