The author doesn’t have a clue. Einstein worked in a patent office initially because he didn’t have a doctoral degree. After he received his doctorate, Einstein held positions in several prominent universities - including Princeton after he left Germany in 1933. Einstein certainly “disrupted” Newtonian physics, but I don’t remember any of the biographies of him or his contemporaries that I have read stating that he was an especially “difficult” or “disruptive” colleague.
He couldn't get into a program that led to a doctorate because he marched to his own drumbeat. Not "disruptive", he just didn't jump through the flaming poodle hoop that was presented to him in school.
Once he was in the patent office, he could breeze through work that would take a lesser man all day to do, and spend the rest of the time reading physics journals.