/u/Helenium_autumnale on Friend always wanted a surprise party. We finally gave her one just for her to complain.

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As someone who worked in the industry, I see nothing in that phrasing that suggests it is AI-generated. I ran the text through Grammarly's AI text detector. (Imgur screenshot of results). 0% AI-generated. It's good to call out AI slop when we see it. It's good to check with an AI text detector such as Grammarly's if you're not sure. Overdiagnosing it without checking isn't helpful. It is also not nice towards the writer who spent time writing their story.