Any teacher who say"無唔好既學生, 只有唔好既老師",
is really a good and serious teacher,
as he just criticize the teacher himself, but not the student.
After I read all your post, I'm afraid you may misunderstand some important point from your teacher.
I've listened Rxxxxo's interview from radio before.
Yes, some of his students cry and get angry of him at the beginning,
but lastly they understand his meaning and change better ... maybe expect you.
Anyway, as I don't know what happen between you, please don't be angry if I'm wrong.