If you already decided to have a career change...

Anyway, you don't want to do this job for long. So.. why pay too much attention to your boss's attitude ? What else you can lose ?

Just get the job done professionally. And try to be happy everyday..

If you get your job done.. at least they cannot fire you..if it becomes so bad that they have to lay off you.. it is okay.. apply for the Unemployment Income and take a vacation..

I know it is hard to work in such an environment.. but just try.