Trans woman who pays a bit more attention to mannerisms than most people, both in men and women.

1. Yes, it's a real thing
2. It's at least 90% men, and I'm being generous
3. It's not most men that do it (especially in the sillier ways)
4. Size matters not

Picture a teenager in black sweatpants and a hoodie, on his own in a bus. That's the most common I think. It's generally men who try to project an image of strong masculinity or coolness. They don't really do it with other people because it's silly. It might be an unconscious thing, idk. It still looks stupid. It's mostly men because it's a masculinity thing.

It's great if you don't do it, and I wouldn't be surprised at all if you didn't. But there very much is a type of guy who does it. And there is no common type of woman for that specific behavior.