Actually I think "scrum master" would be one to start really attacking. It clearly implies that rest of the team are slaves controlled by the master. And that is something probably implemented in some scrum teams...
Or you could assume the "master" means something in the sense of "has mastered the craft of scrum". It doesn't need to say anything about everyone else, it just describes the hat that person is wearing (namely, one of expertise in a given field). The toxic thing here is your insistence on fabricating a demon where there is none.
I'm saying this is likely what the title was conceptualised to mean. In practice it doesn't mean that at all, but that's not germane in this particular context I think :)
I don't understand this need of politically-correct people to always ascribe the worst possible meaning to a particular context, especially when it's clear that that worst-meaning could not have been intended.