the high ground.............................

Management prefers peace over justice.   Firing off harsh memos will not score points and refusing to cooperate with a co-worker can be a ticket to oblivion.
     People who act like spoiled stars are more likely to be regarded as spoiled than catered to as stars.  As political speechwriter Vic Gold once put it, "The squeaky wheel is sometimes replaced."  The wisest strategy in any workplace dispute is to seize the high ground by being as reasonable as possible.
     Let the other person play prima donna.  You may have some short-term losses but you'll gain over the long term, especially as a person.  To paraphrase an old joke, you don't want to win the rat race if it means becoming a rat.

-Michael Wade,  All I Said Was:  What Every Supervisor, Employee, and Team Should Know to Avoid Insults, Lawsuits, and the Six O'Clock News