Pilates faux pas

So in my class tonight, I am preparing them to do shoulder bridge, an exercise where most your weight is on your heels boosted up to the ceiling. There was a new student in the class and I said to her "you'll want to take your socks off so you don't slip" and looked right at her. She still didn't take off her socks. I go over to her and say it again and she says, "I can't, I have a fungus on my foot." I say (without thinking), "oh yeah, leave them on then" inserting my non-fungus foot into my mouth. People start kind of snickering and chuckling. Think I'll see her next week? Not betting on it...