* Do not use your wheelchair to harass people with canes. They are not "faking," nor are you higher up on some sort of disability hierarchy.
(this happened to me a few times -- the person doing it made no small bones about the fact that their disability was more "authentic," since they'd been born with it, and those who had accidents or illness later on in life didn't count as truly disabled.)
* Do not passively aggressively refuse to acknowledge a person who asks you kindly to move your scooter so that they can pass through a narrow hallway.
(one young woman made a regular production of this, using her chair to park diagonally in a hallway that provided the only access to a set of classrooms -- when she finally did acknowledge the request, she'd throw a nasty little tantrum)
* Do not drive down the yellow lane, or in any car or bicycle traffic lanes. You do not get to hold up traffic for mile after mile. Nor should you pop through the crossing when you have a red light or a stop sign to negotiate. Nor do you get to pop in between parked cars on the street and fly out into traffic.
(a lot of people do this pretty regularly around here, and some poor woman hit one of the men when he flew out between parked cars, directly into the driving lane -- she had no time to stop, and continues to blame herself for his death)