This is a good insight and a good question.

The answer, I believe, is that it is a character flaw.

One cannot believe someone else to be inferior without first believing themselves to be superior. Right?

The reason it's because of being men for males, rather than an aberrant character flaw like it is for women is because we live in a culture that elevates the Masculine and both assumes and is designed upon the idea of male superiority. That's the only reason. If we lived in a matriarchy in which womanhood was defined by the negative space of being the opposite of being male/Masculine, then the reverse would be true. The uncommon male who believes himself superior would be an aberration of the established norm while women and girls were born into gender privilege, groomed from infancy to think themselves better, and trip all over themselves trying to prove their womanhood to other women by abusing, neglecting, and dehumanizing men.

The teason why men are such a persistent problem and threat to women is a function of the system, not because men are inherently evil or driven to be this way biologically. That means that were the system reversed, women would not be immune to those effects. We're not magical creatures of light and love that can solve all the world's problems by inspiring men to greatness. We are not balms to the pain of the world. That's myth too. We're every bit the flawed humans as our male counterparts. We have our strengths. We have our foibles.

My opinion on the matter. I don't consider it a character flaw in men, but a natural byproduct of the mantle of Manhood under a Patriarchal construct. I consider a character flaw in women because it's an aberration from the norm.