The problem with Angry Joe came when he got his friends to work for him and became an echo chamber. When he was working alone, he still had the ability to be humble at points, but it's damn hard to do that when two guys stand behind you yelling," yah, you tell em!" in his ear.
That being said Amazon's customer service has never once let me down. I had one click accidentally order me 250 lb. of bricks, and I got with them to correct it. The guy I got was exceptionally polite, canceled the order, and made sure it wouldn't come up on my account. Hell, he was even jovial about it, which helped the situation immensely.
If something was wrong, that happens, but being an asshole to the hired help isn't fixing the problem or making things better. If he pushes to hard, I am sure Amazon could do without his business.