My black friend called me racist! Help me?

Ok so I was searching for something in my black friends cupboard and I tried to pull a book and to my horror nearly 15 empty FAIRNESS CREAMS fell down. I was like wtf. I started thinking how can anyone be so desperate to be white and started gigling. My black friend came in and saw me and called me RACIST and screamed IT IS OK FOR MOST BLACKS TO TRY AND BECOME WHITER and left. I mean I didn't even say anything?