My sons friends are shitty

I do not like my son's friends. He's always had trouble making friends. Especially since he's on the spectrum. He made some friends his 8th grade year and they're going into High school together but they treat him SO poor. They make jokes about his looks, his weight, his race (we are Asian American) and his sexual abuse. I really didn't want him telling anyone about his sexual abuse because I was afraid they would use that against him. When he friends get mad at him they will say things like "That's why only your 60 yo uncle wanted you". Or " Go get raped again. Some of the girls and guys in his group have made jokes about raping him. They made hum cry yesterday for making fun of him and telling him to stop eating and he's disgust. I don't want these friends for him but he's so desperate for friends he takes the abuse just to be part of the group.