How to deal with my gf's racist dad?

im Asian and her family is puerto rican and whenever i go there he call me racist things like lemon head,nine iron,yello devil and a lot more. he cusses me out and once said what do i have to do to get your ching chong *** away from her. he makes me really angry and one day i might just punch him in the face. She can't see me because her dad won't let her leave unless he drives her there