Looking at issues of responsibility:
On a personal level, you are responsible for your own training, including your safety, therefore there is nothing wrong with politely refusing to train with this person. Period. No reasons, no excuses, just "no thank you, I prefer not to."
On an institutional level, the pattern of abuse is such that the chief instructor is seriously abdicating his or her responsibilities by not taking charge and throwing this person out. I would seriously question my committment to training with such an instructor unless there were literally NO other training options in town.