In my opinion, people that do not have character will have technique that rises to the level of bully and never goes beyond. I recently saw a shodan test. Those testing each did 375 different techniques (This included everything from rolls, falls, and the simplest techniques). They went for about 5 hours with 45 min or so to eat. The test was supposed to last 2 days but apparently it went very smoothly.
Those testing were always in control, disciplined, and polite even when the testers tried to get under their skin. I think that when a black belt is given that it represents the person who gave it, good and bad. I judge a teacher by his black belts and not just his skill. To you, their attitudes did not reflect a true black belt. That should tell you something. You should not try and deny it.