Why do men use the, "you’re too emotional," line when you’re winning an argument?

Like seriously it pisses me off! I’m actually winning an argument and I’ll admit I can get pretty passionate when I’m confident in my stance. But as soon as the guy picks up on that he goes with the why are you so emotional about this? And it just derails the argument.

God it’s bullshite!

Why do men use the, "you’re too emotional," line when you’re winning an argument?
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