Nazi Knitting Teacher

I met the worst knitting teacher in the world today. Here's a blurb from an overheard knitting teaching session in a town in Iowa (not Sioux City). "No, that isn't right. Can't you see that this stitch is a yarn over and this one is a Purl?"
Perhaps she should have explained to her student that the purl stitch is actually the back side of the knit stitch.