Probably for the same reason I disliked the Sinatra content so much, too obviously fake.
The whole of the parent comment was that single remark I quoted, before they edited the comment.
They were intending to lob a passive aggressive insult on the lighter side. They didn't like my comment, so they fired off a shot about my comment being equivalent to a questionably human, possibly mediocre GPT3 text.
I don't mind that sort of mild insult in response, I just prefer it without the unnecessary facade of the smiley.