How Racist? Should I be offended?

[nickey009]

I thought this was pretty funny.

My girl and I were sitting at Cost-co enjoying our 1.50 polish dogs and a churro. I'm 1/2 Chinese and 1/2 Japanese. She's 3/4 chinese 1/4 Cambodian. Anyway, this dude sits down next to us and looks over and says "Hey, do you guys speak Asian?" I give him a sort of "what the hell did you just ask me?" look. As soon as the words escaped his lips he reeled back and said "I mean, do you speak any Asian languages?"

So, should I be offended? Would anyone ever go up to a random black guy and ask him if he speaks Africa?