Over the years Bader has been much discussed on this forum.
The overall conclusion was that he was very brave, very tough, incredibly driven - and he wasn't a nice man at all. I don't think he was much more of a racist or a snob than maybe others of his time and place. He was unpleasant to everyone, not just the lower classes.
But then how do you make yet another documentary on Colditz that anyone will watch without deliberately stirring up controversy??