Help me Hosers, you're my only hope..

So I've made a total of three "friends" here. I use "" because I've only hung out with them each a couple times but from what I've learned I do really like these people. Now I'm meeting one for some drinks shortly and she started our conversation by texting me "Whats up N***a lol"..... Uhhh WTF. No.

I have NEVER EVER had to hear that. Now my jerk reaction is to say (I didn't reply to that text, I want to tell her in person): "Don't ever say that to me again. Full stop." But I want a nicer way of saying it because I've only known her for like a week... Advice?