I'm not sure who invented the term 'toxic masculinity' but everybody who uses it should be embarrassed by their own stupidity.
It deliberately conflates negative and positive characteristics. Every intelligent man knows that bullying, unprovoked aggression, sexual assault and misogyny are unacceptable. On the other hand there are a whole spectrum of positive traits that are typically male. Men and women are not the same above the neck. Being a responsible man is not synonymous with becoming more like a woman.
Women who push this misguided doctrine on a generation of boys are hypocrites. Study after study demonstrates that women ultimately choose men with typically masculine physical and psychological traits.