I was treated very nicely as a CNA --that was 15 years ago.
Now as a RN I've come along rude patients, Dr.'s, nurses, families, CNA's but there hasn't been enough rude people in my career that would make me quit nursing at this point. I had one manager that tried to make my life horrible. I left that job and since have had good experiences overall.
That is very horrible you haven't met a nice nurse yet. Perhaps you need to work at a different hospital or facility.
The hospital I work at the CNA's tell us how much they enjoy working with us. It's much better working in a cohesive environment. I'd honestly leave your place of employment.