Different dude, but I’d like a definition from you if you don’t mind.

I’m personally not a fan of it but I’d love never had a formal definition shared with me so I’m willing to have my mind changed.

For me the issue lies in masculinity being a gendered (in my mind) term and the behaviors often described under toxic masculinity being behavior that are expressed by anyone. So I’d just call them toxic behavior and treat the people as toxic people.