Law is a pretty adversarial field, though the tearing may mostly happen in the context of the practice itself.

Any sort of contest based profession usually has some large and clashing personalities that do some trash talking.

Scientists will go after each other’s research if that counts. Dead fish MRI comes to mind.

Coding. “Who the hell wrote this crap code?” Checks blame. “Oh, me.” See also Linus Torvalds mean phase.