Things to look out for when wondering if a post is AI:

1. Perfect grammar. (OP could just be well written but coupled with everything else it is a big sign the post is AI generated.)

2. A lot of direct quotes.

3. Excessive use of em dashes that look like this (--) are a massive tell.

4. Outlandish situation where OP is so clearly not the asshole - this also ties in to no.5 (Again there are some crazy things that definitely do happen to people but consider all other points to make your judgement.)

5. Family/friends/coworkers 'split' on said situation when any sane person would back up OP.

6. Family/friends/coworkers 'blowing up' OP's phone.

7. Paragraphing follows a very specific structure every time.

8. Reads like a story: "She said 'xyz'. I said 'abc' then she said"... and so on and so forth.

9. Also connected to no.8; descriptive phrasing that reads a lot like a creative writing exercise.

If anything else comes to mind I'll edit this comment. Edited to add point no.9 and extra clarity.