One of my grandparents was black, one was full native American, and the other two were Jews/white.
When people meet my family they sometimes ask if I'm adopted. People have said things like "But your hair is perfect!" or "You have such a nice complexion!"(I don't even know what that means in regards to my heritage?) or tell me I look "so white" as if they are complimenting me.
Yeah though, I'm not annoyed that people think I'm entirely white, by looking at me it's impossible to tell I'm not. I just get annoyed when people all but congratulate me for how white I look.