Of the six organisations I worked for, three came to me because a person who had worked with me recommended me to the person who was hiring. Not all of them were people with whom I got along with from the start- I even had major professional differences with one, which we managed in a mature manner, without having to resort to name-calling.
Even if you don't think being nice is the right thing to do, extending basic professional courtesy to the people you work with is a sensible thing to do.
Why do so many people not get it?
A drabble is a story told in exactly 100 words.