Good thing this is on Live Journal or I'd be banned by now.
Problem 1: Take off your left pinky finger. Just pop it off. Can't do it can you? If you are male masculinity is a fundimental part of your sanity. Without it you go insane. Take off a small (toxic) part of your mind you go insane.
Problem 2: It's psudo science. It's the same as creationism. It's feminist ideology branded as science however it's entirely unscientific. If you repress part of the human psycology to builds up and returns in a big way.
Problem 3: It's a misrepresentation of reality. "Boys will be boys" has to do with some bizzy body demanding kids not play rough. It has nothing to do with bullying, fighting or rape. Etc
Problem 4: What gets called Toxic masculinity is called stoicism. It's needed in the modern male to be civilized. The very thing called toxic that feminists want gone is that thing that gives men the ability to handle rejection, to be civil and not use violence. Everything feminists think toxic masculinity causes it actually prevents.
In short toxic masculinity is removing a fundemental part or your sanity when you can't because a psudo scientific theory says it'll make the world better when it can't and fix problems that don't exist.