The people doing my training treat me like an idiot. I just quit, did I do the right thing?

I would have spoken to the boss about the way the other employees treat you. Also never just up and quit without at least a minimum of two weeks notice. It its just not a good or fair thing to do to an employer. People nowadays have no patients. Those other people should have tried to be understanding of your needing a little more help. Sorry that you got stuck with people like that.