I too went for an interview with this arrogant, ill-bred twerp. I too, wondered about his skanky office in a plainly almost-empty building, (got on the cheap from a desperate landlord?) and I too thought his manner was rude, arrogant, off-hand, and I too wondered why he wanted to withhold part of your pay. I suspect he'd had so many people leaving early because they disliked him that he was forced to try this tactic to retain people. It can't have been that they stayed because he was so likeable.
I also wondered if his hair was dyed blond or natural, (it looked dyed and I though I saw a hint of fake tan) and also wondered why he was so rude to the girl in his office (who may have been his girlfriend, but my gay-dar was twitching when I was there) .
I asked about progress and end of course tests, to which he testily replied that they didn't have tests, they had 'outcomes'. What a load of bollocks - when he described what they did, it was obvious that they gave tests by any other name. He'd obviously been reading a book on bullshit buzzwords, or maybe educational theory.
Then, despite him knowing the interview was booked, and having my CV in front of him, he plainly had not prepared, had not read the CV, anything. He started to read it in front of me, and then just went through it point by point, in quite a sneering manner. Despite working for 18 months in a language school, he sneeredd that I had had no 'business experience (what, an IT project manager for 8 years? I think he meant teaching business English experience.
I was wondering how to get away from this obnoxious little twerp when I was saved by the bell - the phone bell. He was bad-mannered enough to take and continue with a phone call (why couldn't do me the courtesy of telling the caller he was busy and would call back in 10 minutes or so?). I was so irritated with him by then that as he spoke in his arrogant way, I just stood up, say I had to go and got out of there without turning round.
Most unpleasant little person and a waste of a journey and my time.