Sorry guys,
ALWAYS say hello/goodbye to ATC.
Teach this in flight training, as you need to teach students the "real life" situation, not only what is said in the book.
Keep the "strictly to the rules" in the classroom please and teach your pupil to be flexible, adaptive and indeed, a pilot ready to be released in professional aviation world.
Any examiner who fails a student for that is not suited to fly, let alone examine as he clearly has no idea of what the word " professionalism" should mean as an airline pilot.
Why oh why are some people still focussing on unimportant little details in flight training (like this ATC call) but at the same time disregarding a students ability to improvise, think and make logical decisions. This is what airmanship is all about.