Chick: Oh, so that TA made this problem set?
Dude: Yeah, he made that genomics, b!tchy set, too.
Chick, pointing to Asian TA in back: That's him!
Dude: Dude, no! He's white.
Chick: Oh... I've been hating on the wrong TA this whole time!

Source:  And She's Totally Sleeping with the Wrong Professor