It's derailing because rather than address the concerns under discussion, it discards them by punting to a different level of abstraction. It's toxic because it has become so damn prolific, probably because on the surface it seems edgy.

I'd often make a similar point to argue against this centralized communication technology being adopted in the first place. But now that it has become society's main form of communication, pushing this point on its own does little but condone censorship.