The idea of toxic masculinity is that it's a set of negative behaviors among men that are reinforced by other men. "Toxic Femininity", if it existed, would have to be a set of behaviors reinforced by other women, so the "disposable male" idea wouldn't really qualify as part of it.
Also, the idea of the disposable male is a bit misleading, because it really only applies to less privileged men, barring exceptions like "women and children first" on a sinking ship, which really is another example of toxic masculinity anyway.
This is a discussion about toxic masculinity, which is a set of social constructs enforced by men upon men. Of course women are part of reinforcing gender stereotypes, it's just a separate issue.
The idea is that if there weren't social pressures enforcing gender roles, then lots of negative social aspects of masculinity could go away, and men wouldn't be shunned as elementary school teachers, or discouraged from seeking help for emotional issues. I don't understand why anyone would be against that, and I also don't understand why you're resorting to such argumentative replies.
Also, the idea of the disposable male is a bit misleading, because it really only applies to less privileged men, barring exceptions like "women and children first" on a sinking ship, which really is another example of toxic masculinity anyway.