I'd agree that it was intentional, but I find it hard to enjoy a film with no characters that are likeable unless there is an underlying reason for it and that's what they tried to go for in Whiplash, because the teacher gave a speech about being harsh on his students, when he was in the jazz club; they were trying to make the audience sympathise with a teacher who seems very aggressive, but has his students in his best interests, but it seemed forced to me.