That seems fairly typical, but what if the perpetrator of the bad behaviour happens to be the instructor? Anyone else ever had this happen?
I would leave the dojo. I don't think such instructor would be able to keep students. People with self-preservation instincts would leave at once, others would be injured and would not be able to continue their practice.
In your case that's the only dojo in the area, but maybe you can join with other yudanshas who do not want to train with that person anymore and create a dojo or if it's financially impossible just train together. That's better than being injured and not being able to continue practice anywhere anymore for the rest of your life.