"Whether you think that you can, or that you can't, you are usually right." - Henry Ford

You can start to overcome this by telling yourself that your are amazing at interviews. Eventually you will start to believe it.

At the end of the day an interview is just explaining why you are awesome, and then getting the interviewer to tell you why their company is awesome.

I hope you can get out of this toxic environment. No one deserves that kind of disrespect.