I worked at Meta in a dysfunctional department where this was the case. There was an IC8 who refused to engage, was "too important" and "too busy", and refused to concede any point, but was quick to insert FUD, bikeshed on edge-cases, and shutdown discussion if it distracted from them talking about their projects. Total asshat. There were also several other strong (asshole) personalities on my immediate team who refused to explain themselves, refused to listen to others, and refused to consider any one else's viewpoint. It was most a competition of who was advancing their particular service and their code, while slowing everyone else down by refusing to sign-off commits until round-after-round of trivial revisions and delay.
