[Another poster's opinion]
> it did seem to oversimplify and intentionally misinterpret the comment for the purpose of a shallow gag or unimportant edge case
I'm surprised that bringing up an "edge case" against an over-generalized statement is considered "intentionally misinterpreting" the original comment.
I think charitable reading of comments goes both ways - if we are supposed to read "Let kids discover their limits instead of purposefully (or accidentally) imposing your own." in a charitable manner, why should we assume that a short comment that brings up an edge case is (only) intended as a sarcastic dig at the original comment? It definitely forces the reader to think of beyond the "ideal" case, going into the realm of practicality. It is short, admittedly sarcastic (probably bad, but you complained about more than sarcasm), but I think it gets the main point across.
Alternatively, if we're not feeling charitable, I think it can be fair to say that the original comment paints a way too simplistic over-generalization of the difficult decisions in parenting, maybe even trivializing the hardships of parenting and blaming parents for not being more encouraging to their kids despite the parents having tried their best to manage practical difficulties -- in which case the reply still makes sense.
BTH I just think you (and others) were simply biased towards "positive" comments that you agree to. The long exposition by cortesoft was nice, but unnecessary once the edge case was brought up (I for one, understood what he/she meant). Do we really want to impose a minimum limit on post length just to make people feel less offended?