Questions: Relationships

I'm 19, she's 20. She's not 100% black... her dad is white, but her mother is a 100% black African-American woman. However, her skin color is still very dark. Only slightly lighter than her mom's. Though she does have straight, very long hair... which is possible in black women, just uncommon.

We were already dating before I moved out of my parent's house. By now, we've been together for about 8 months.

8 months may not seem like a lot, but we've been together almost every day, several hours a day, so she's the person I love most in my life right now.

I love her because she's cute, outgoing, confident, kind, intelligent, athletic, sexy, seductive, laughs easily, and a great support system when I'm down.

About a week ago, there was gonna be dinner at my parent's house... I let her know my parents are incredibly racist once again, like I let her know less than a week into our dating. She said she's used to it though, won't take it to heart, and just wants to see what kind of people they are.

So I let her come along...

At first, me, her, and my parents got along just fine. For the first 20 minutes or so. But then they began making comments.

"She's just your friend right? I mean you couldn't possibly be dating a (n-word)."

"She looks more attractive than most (n-word), but her skin is too dark for her to be a real lady."

"You wouldn't do this to us. If I had (n-word) children, I'd commit suicide."

And I could notice my girlfriend getting increasingly more and more mad, though she just kept quiet.

But then, I snapped, "STOP THIS! SHE'S MY GIRLFRIEND, WHETHER YOU LIKE IT OR NOT! AND IF YOU'RE NOT GONNA LOVE HER LIKE A DAUGHTER, I DON'T WANT ANYTHING TO DO WITH YOU BOTH ANYMORE!"

And my parents just sort of stopped talking, and my girlfriend smiled.

I don't regret this, and neither does my girlfriend, but do you think I maybe was too hard on them/went too far?

Like when they were a kid, you just saw them as that and nothing more. Strictly platonic!

But then when they got to a legal age, your brains like... "hmmm..." *licks lips* "dey do be looking like a snack." *rubs hands together*

What would you do? Would it be too weird for you? Or could you overlook the memories and age gap if they wanted you as well? What are your thoughts?

It's a twenty something pages I have written last year and that it's addressed to her and how I think her behavior impacted me and my sisters. It gets quite strong-worded in some points and I do call her for what she is or at least used to be, but I also thank her for the few good things she did for me and her trying to reconciliate.
I had given it to her one evening she visited us but she didn't read it and left it there, so I did not talk about it anymore and kept it in my nightstand. I just photocopied it to have a copy to keep for myself in case I gave it to her.

Would it be worth to try giving it to her again?
We'll be moving in a little while and it will be months before I'll see her again.