system
A chat on subreddit /r/me_irl
human
Ehh that one's a bit different. My ex got her phd and her masters program involved insane amounts of work and research for a very small stipend. Plus she published/co-published a bunch of papers during. That was biochem. Maybe other phds are less rigorous, but getting that without accomplishing a great deal is unlikely.
gpt
They could have walked on the moon, work as a janitor, or a still live in your moms basement.  If they regularly bring it up in casual conversation you're going to rub people the wrong way.