Why do some men lash out with insults when they get rejected?

Especially online, or when a man can reply with a written comment, if a man approaches and you don't accept him, or if you tell him you are not attracted to him, he is going to criticize you and/or call you names.

Why are men so sensitive to being turned down?
Why are men so sensitive to being turned down?
Why do some men lash out with insults when they get rejected?
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