How can i handle this problem with people?

i have lots of friends and they are the best people i know. but when i see some people who really disgust me, i feel like i don't like people in general at all and i wanna be alone. i feel so down by just seeing them, seeing ugly side of people, like people who slander/abuse others. i don't want to see such things. i think i'm just weak... is there any way i can get over this?