Why? Because they are ALLOWED to be. A woman can scream at a man, and hit him, and usually not face any consequences. A man who yells at a women faces consequences for "emotional violence". He faces jail time if he actually hits her, or even tries to restrain her from hitting him.
A guy doesn’t even have to yell to inflict emotional violence.
“Emotional violence occurs when someone says or does something to make a person feel stupid or worthless.”