If you are honest but a gentle and/or understanding person can you help me with this problem?

I have a tendency to prejudge people who are "cute" I always ume they would be mean, not just girls but guys. So far in my life, I have honestly had more "cute" people be nice to me than "ugly" ones. I know what I am saying sounds shallow, but how can I stop judging people for their looks? For example, I do not think Eva Longoria is all that beautiful, I do think she's pretty. I have a tendency to nit-pick things in our people's features and compare others. I though Ms. Longoria was pretty until I heard her being compared to Beyonce, Meagan Good, Halle Berry, Kim Kardashian, the other celebrities I honestly consider more attractive than her. I really want to stop yzing looks and judging people as "bad" because they are "pretty"