The last TKD instructor I had was this old Korean dude. Thick accent and everything. He used to brag about the time he kicked a guy out of his school for repeatedly calling him "Master" instead of "Grand Master" or "Dojunim". Even at the time, unawakened to bullshido as I was, I just thought, "what an asshole." He thought he was impressing me by telling that story.
Sad. And though I didn't leave at that time, I look back on the stuff like that and remember how much bullshido there still is out there.