PC "Back story", why is that a thing?

[Max_Killjoy]

I would go with "Pointing out how the logical implications of the language being used unfairly characterizes those that have different playstyles as having inferior tastes". However of those two I'll go with "non-sequitur".

And I'd go with "deliberate attempt to turn the discussion to something it's never been, and then argue against that instead".

Nothing about "the limited choices in character background given by some CPRGs is better than the no choices in character background given by the DM we're discussing in this hypothetical" carries any implications about choices outside the context of character background.

I'm sick of this nonsense in discussions, online and otherwise, of having to sidetrack into something that was clearly never said.