No? If the article has issues, and you have domain-specific knowledge to correct it, please share to the benefit of all of us. Just because there are a few issues doesn't mean the whole thing was a waste, especially if it motivated an expert to share.

I don't see any tone in this reply which makes any personal attacks or even any major value judgements on the article itself such as "this is crap not even worth reading" as such I, the reader of both, am informed of an alternative explanation.

The author is then also invited to revise their article if they agree with the feedback.

Perhaps the grandparent could have thanked the author or opened with some positive feedback first, but given the grandparent took the effort to write detailed answers in a noncondescending tone, I see it as a quality informational post. I hope others do too.

Is the GP wrong? Of not then I don't see why you're bothered.

A confused explanation gets halfway round the world before a valid explanation gets its pants on.

i'd say it is constructive criticise more than "ripping someone apart". yes constructive criticism can make you feel bad, it doesn't mean it was intended to be hurtful. is this a class that just isn't taught nowadays