The criticisms could be absolutely correct, but the response doesn't "reason" anything.
The response doesn't actually demonstrate that the parent is incorrect or propose a complete alternative. It simply states that it is wrong without a shred of evidence or exposition, only vague phrases suggesting omissions.
That's not an indictment, just a wordy insult.
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I get the frustration with what appears to be shallow understanding of something turned into a sweeping judgement, but at least it's attempting something constructive. The response is pure aggressive arrogance.