NotSpaghetti
I didn't read Politics Nerd as nit-picking. (just saying)
The trouble with words without inflection or body language to accompany them is that we do have less clues as to meaning and not many of us read and revise what we are saying when chatting online (like this).
I don't think anyone was a bad parent from a few words written here.
For what it's worth, I can honestly say I've never used the word "naughty" at all, let alone with children, as it's a word I hate for it's rather frothy lack of specificity! 
No, it wasn't just nit-picking.
I presume PoliticsNerd completely misunderstood what Mollygo said and a qualified apology seemed insincere.
The point is that referring to a child as a naughty child is similar to referring to a person as an illegal. Both are wrong in that they refer to the person, not the action.