The Programmer Identity Crisis

Whenever I see an em dash (—), I suspect the entire text was written by an AI.

That says more about your lack of writing skills and understanding of grammar than AI.

That's a silly take, just because they existed and were proper grammar before AI slop popularized them doesn't mean they're not statistically likely to indicate slop today, depending on the context.

What's sillier is people associating em-dashes with AI slop specifically because they are unsophisticated enough never to have learned how to use them as part of their writing, and assuming everyone else must be as poor of a writer as they are.

It's the literary equivalent of thinking someone must be a "hacker" because they have a Bash terminal open.

You're overthinking it. LLMs exploded the prevalence of em-dashes. That doesn't mean you should assume any instance of an em-dash means LLM content, but it's a reasonable heuristic at the moment.