I think that things would go better for you if you went in determined to not think of your clients negatively. You use a lot of derogatory terms that make you come across as thinking you are better than your clients. I certainly hope if I ever need help I wouldn't get someone who thought of me as you do your clients. They need help because they have illnesses and not because they are misbehaving. The behaviors are exactly why you are there and if you can't tolerate the behaviors then maybe you should find another job.

I worked in psychiatric care as well as nursing homes and home health. I know it's not easy. But your attitude can make it a whole lot easier or a whole lot harder and it's the one thing you can control in that sort of job.