I fail to see how the advert in any way poured derision onto men.
The semantics part is where you say that there's no such thing as toxic masculinity. Of course there is. There's toxic femininity, toxic islam, toxic gaming culture, toxic dog-owning culture, toxic pretty much anything. It's simply referring to the portion of the subcultures that encourages or reinforces or tacitly condones 'bad behaviour', in this case bullying and sexual harassment. Maybe we could argue over the extent of these problems, but you surely couldn't argue that the problems don't exist.