Think the notion that ‘no one’ uses em dashes is a bit misguided. I’ve personally used them in text for as long as I can remember. Also on the phrase “you’re absolute right”, it’s definitely a phrase my friends and I use a lot, albeit in a sorta of sarcastic manner when one of us says something which is obvious but, nonetheless, we use it. We also tend to use “Well, you’re not wrong” again in a sarcastic manner for s…
Em-dashes may be hard to type on a laptop, but they're extremely easy to type on iOS—you just hold down the "-" key, as with many other special characters—so I use them fairly frequently when typing on that platform.
You’re not the first person I’ve seen say that FWIW, but I just don’t recall seeing the full proper em-dash in informal contexts before ChatGPT (not that I was paying attention). I can’t help but wonder if ChatGPT has caused some people - not necessarily you! - to gaslight themselves into believing that they used the em-dash themselves, in the before time.