Calling a person crippled is considered rude.
Alex is in an argument with a guy in a wheelchair over a parking spot he pulled into.
Alex wants to express his frustration.
Alex tells the man just because he isn't in a wheelchair, doesn't mean he doesn't deserve the spot.
Alex laughs at the wheelchair guy and calls him a cripple to his face.
Alex gets the spot, the wheelchair guy wheels off irritated, but understanding.
Someone overhears and records it, and it goes viral on twitter and Alex gets fired.