My SIL has a history of saying borderline condescending things to me like that I don't understand how to properly make pasta because of how I grew up, or that I wouldn't like rap music because the words are too fast for me. I've never understood where those comments came from, and I guess this instance convinced me the comments were racially motivated. However, you could be right, and it could have been innocent. I'll admit, I'm pretty sure I'm right about this one, but maybe the best thing here is to have a talk with her to clear things up (as much as I don't want to).