You can learn portions of tending the bar by watching how bartenders pour certain drinks, in what order they put the ingredients in, how they deal with customers. Your father's words have some merit to them, but they are not categorically correct. I didn't gloss over your post - the point about him being so raw is important to the conversation because since it was his third year, it was time for him to show that he can overcome adversity and know to step up in the pocket.
I'm sorry that you feel targeted. I'm not trying to be flippant.