Why do men speak more softly towards women than men?

when they talk to women , they talk in a much gentle, sweet , quiet tone. Sometimes they might laugh a little like a woman. When they turn around to talk to men, they seem too loud, brash, and the opposite of gentle voice. but the guys don't tend to mind. It sounds as if they are trying to yell at me.
Why do men speak more softly towards women than men?
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