How do you deal with racist parents?

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My parents are basically clueless to this fact even if I have brought it up to them in the face. They seem to be completely obvlious to the fact that their comments are both rude and ignorant. If anything they seem to take pleasure when they insult other races such as Asians or Mexicans. I've stopped eating with my family at dinner simply because their racist comments drive me up the wall. There's been times where I decided to eat with them, and ended up leaving simply because I got tired of their ignorance. But at the same time I have to deal with them calling me weak and immature when I do this. My dad started screaming at the news when they showed this middle-aged woman sobbing as she talked about how the recent store caused her house to flood out. Apparently since she "looked mexican" that meant she was a "illegeal immigrant" and that she "stole people's jobs." The truth was that she didn't even look Mexican. When I tried to explain this to her her went off on me, and basically told me that I was wrong. At this moment I picked up my plate and started to walk towards my basement. (Heard my dad call me immature because I couldn't handle the truth. Personally, I didn't want to hear him judge someone else. I hate a lot of things about my dad; how he goes onto the Yahoo! Chat Room's voice chat and preaches and on how every Muslin and Arab are terrorist. Or how he gets joy when he has a chance to insult a Mexican or Asian in public. (Apparently he still hates Asians for Pearl Harbor.) But at the same time my parents are nice---just not with they are in racist mode. I'm confused.