Of kissing and covering backsides

Quoting my prof "If your customer is an a**ehole and he is your number one customer, then you kiss his a**e. Else, you dont get sales and you lose your job." Reminds me of the dialogue from the movie "Top Gun": Slider to Goose: "Whose butt did you kiss to get in here?" Goose: "The list is long but distinguished." After the class, I had a discussion with an accountant classmate who worked for one of the big 4 accounting firms. He told me that the first thing they were thought is "Cover your a**e."