My girlfriend's parents want to split us up

You know that you could actually go to the police with what he said to you, yes?

It's not her fault.
And you def shouldn't listen to her parents.
You'll always get parents that don't want their children seeing whoever they're seeing.
It's up to her, and whether or not she can deal with her parents not approving.

But mate, honestly, I'd think about the fact that her father is a racist pig, and whether or not you want to report it.

Totally disgraceful behaviour

I would think seriously about telling her parents what you think of "people like them". I cannot believe people have the audacity to share their revolting views with the people they are prejudiced against so freely! I don't think you need to be rude to them, but maybe just go back round there, say to pick up your girlfriend or something, and say something along the lines of "I thought about what you said to me, and although I was a little embarrassed by the thought of going out with someone whose parents are so bigoted, and what it might do to my reputation, I decided to be the bigger person. We're both adults and I am prepared to tolerate your views if you treat me with the respect I deserve. We need say no more about this, but if you persist in harrassing me over the colour of my skin I will think about contacting the police. I'm afraid you can't and won't stop me from seeing your daughter on the basis of my race and you would do well to listen to her more enlightened attitude." You'll need balls of steel but if you can pull it off you should embarrass him so much by his behaviour that he'll never speak to you like that again. Remember racists are essentially cowards- they are just afraid of what they don't understand. You have a real opportunity here to open the minds of some of the last minority of bigots in this country. I really hope you can find it in you to do the right thing! Best of luck and I'm so sorry anybody had the nerve to speak to you like that in the first place.

Yeh, that's a really REALLY stupid thing to do - sure, the parents can't technically stop them, but they can make things very VERY difficult. If they already don't like the guy, they're not gonna appreciate that speech, and that speech will simply confirm their warped views of Indians. The parents can easily stop their daughter going out, check up on her, ring her when she's out, "Oh you say you're with your friend? How's she doing? Let me talk with her for a bit." for example.

OP - your best bet is date secretly. Or simply don't break up - by the sounds of things, they're not the type to force their daughter to break up with you. Just pretend the dad didn't say what he said and carry on as normal. If that doesn't work, then yeh, date secretly.

Because if one day they decide to get married and the parents learn the two of them have been going behind their back and dating for years, that won't confirm their warped view of Indians and write off their opinion on this guy permanently?! I personally would never let somebody speak to me like that on the basis of the colour of my skin, whether they were my partner's parents or not. If the OP decides he doesn't want to confront them that's his own choice but I cannot see how dating secretly will ever be a good option. Perhaps he could just carry on as if nothing was ever said but if I was the father I would then just think that the disrespectful kid hadn't understood and try again to intimidate him.