Teachers and students. The idea is simple: Learn from someone who knows more than you do about a subject. You learn, you become more familiar with the subject, and then you get what you want. This process goes swimmingly when the teacher cares about the student as a human being first, and a student second. This is great, right? Yeah! It is! But what happens when the teacher is bitter and sarcastic? Biting, and aggressive with criticism? Ouch.