1. Pushing code and being unaware of the build system that does anything else.

2. Unable to comprehend that there can be teams/companies where some products are written and maintained by one person, and does not have any practical code reviewing. (This is not a good thing, but it is not difficult to imagine how that can be).

3. (and lately), people explaining things that come off to me as SWE/SRE friction, as opposed to the typical google SRE hiring/book propaganda.

I'll add anything I can think of, but obviously it's one persons opinion.