I've had one co-worker with something like a decade of experience on paper, who was proud of his C++ despite having never heard of the standard template library — lots of `new` and `free`, not a single smart pointer (https://en.cppreference.com/w/cpp/memory#Smart_pointers). And the code they wrote had a lot of copy-paste going on, which I ended up finding because I'd put in a "TODO: deduplicate this" comment somewhere and found it in his newly duplicated class one day.

They absolutely were not interested in learning anything. I left knowing more C++ than they did despite having started there with total C++ experience of a hello world tutorial, and the fact that I still don't count myself as a C++ dev today.

Nope! I reverted a commit once, since a colleague pushed something that didn't compile to master. Sent the guy a polite message notifying him that something seems to have been amiss with his last commit, and to please let me know if he wanted help fixing it.

Boss called me 5 minutes later and tells me off for creating "bad vibes" in the work environment.

Colleague then proceeded to forcepush his "fix" that still didn't even compile to master, removing a new feature I was about to roll out to production, because he didn't know how to merge his changes with the revert commit I'd added

This was when I decided to quit

Oh I should add this developer bragged he had 10+years working experience. Not that I believe him, but still