It was me. I'm white, ended up dating a long time friend of mine, who is black.
We were talking about going to the beach the next day, and I mentioned that I needed to buy some sunscreen. GF tells me she has some, so no worries. I asked her why she had sunscreen.. She was puzzled, for a moment.
She then responded "Yes, black people get sunburned. Just because you haven't seen it, doesn't mean it doesn't happen."
And she was right, I just assumed, in all my whiteness, that black people didn't sunburn. She still makes fun of me for this. I am in my 30's..