- "This is stupid" or other negative comments in code reviews (aka non-constructive criticism)
- Yelling or cursing at people because they question you and your decisions.
- talking bad about the company or other teammates to people behind their back.
- throwing a "temper tantrum" when you don't get your way when it comes to some architectural decision.
- refusing to work with certain people or only willing to work with certain people.
- Making large-scale decisions and changes without documentation, discussion, and buy-in from engineering leadership and your peers.