Minato: Kakashi's father is Sakumo, the genius ninja feared as The White Fang of Konoha. In his time, the "Three Great Shinobi" of Konoha legend paled beside him.
Growing up beside a man like that...it's hardly a surprise that Kakashi's standards for others are unnaturally high.
Obito: The White Fang...come to think of it, I'm sure I've heard of him. He's some hero who saved the village, and died in the line of duty. Funny, I've never heard Kakashi say a word about him.
Minato: He was a great man revered by everyone...including, of course, Kakashi. That is, until the incident...