It's a coherent thing to argue for, I'll give you that, but it's also.. kinda arbitrary? And one can make an equally convincing case for statelessness in the sense that just because one word carries metadata, doesn't mean that the other words around it must react to it.
Is it possible that you have a good point about inclusive writing in general, but you just happened to hop on the wrong case to make your stand, didn't realize that we're talking about an explicit "mr"?
Isn't a strawman something I would make up that you would have said to then attack it?