Aggression is not warranted in a professional environment; neither overt (a la LKML) or covert (passive). Lying is not warranted under any circumstance. Being professional means not calling people names.
All of this stuff is what you get taught in kindergarten, it's not rocket science. Mental abuse is no better than physical abuse, and given I don't buy that hitting developers with sticks makes them "better" somehow I'm also not going to buy into clue-by-four beatings being any better.