Why do Americans constantly accuse women of being men?

It’s happening right now with macrons wife, they did it to Michelle Obama and lady Gaga a while ago. They always seem to pick a target and then relentlessly hound them over the internet. They’ve done it to so many other people but I’ve never seen one proven right.

Why do they always obsess over these things instead of worrying about all the horrible things and horrible people in their own country.