The Ken doll was created to be Barbie's boyfriend because, duh, women need men (that's sarcasm, just in case you missed it). Your example of a children's toy causing a double standard is amusing, though, so there's that.

I implore men to speak up when they see another man degrading a woman, because that man dehumanizing the woman is not going to listen to a woman, but he might listen to another man.

You are that man that needs another man's influence. With your double standard excuse of an argument. Clearly, a woman is not a person worth listening to in your view.