Hi Squidgirl,
You had mentioned that you only have to work with him for a bit longer?
How much longer? If it is a fairly short amount of time, I would recommend that you keep your head up and just try to stick it out until you are no longer in this toxic environment. I’ve learned throughout the years that work superiors aren’t always the most pleasant people to deal with. At the end of the day, you need to remember that they are in the role that they are for a reason. Life isn’t always fair and sometimes you just gotta bite the bullet. Maybe let your boss know how you feel towards the end of your tenure so they are aware of their behavior.
In the meantime, just continue to do your thing. Strive to be a better person everyday. One day, your boss will be a forgotten memory.