Ok I've had one experience with a guy that I guess thought he was a rockstar, in my opinion he was my level (from looking at the code, although he was much better than me at DevOps), but he did have one awful failing, he didn't want to figure out why something was the way it was and just decided to rewrite everything.

Also he thought I had done something using ElasticSearch because I was an ElasticSearch guy, instead of having learned ElasticSearch because I thought it was what was needed (and no amount of explaining this simple concept could penetrate)