I kinda think this particular guy would get flustered and extremely frustrated whenever something would go wrong or there was a tight deadline, so he would take it out on everyone around him (dude would regularly threaten to have people fired for small mistakes that could easily be fixed). And since we were in an IT department with aging equipment/tech, there was always something broken or an effort to upgrade going on. It also didn’t help that he thought and firmly believed that he knew better than everyone else. After I got transferred, my manager had to take over his team because the rest of the PMs were either full up on bandwidth or just straight up didn’t want to work with the guy.