Of course they do.
You can fool some of the people some of the time, but not all of the people all of the time.
I often wear toe nail polish, but it's invisible because I don't take my socks off, except when I shower ...
and when I go to yoga. One of my yoga instructors was really cool with it, and we would even compare pedicures at each class. Well, there was one class where my regular instructor was out, and we had a substitute instructor. I didn't see this as a reason to hide my toes, so I took the class barefoot like every other day.
My regular instructor was back the following week, and he told me a funny story. She said that the substitute instructor contacted her during the week and said, "Do know that one of the guys in the class was wearing red nail polish?" My instructor told the substitute instruction, "That must be S. He almost always wears nail polish."
So, just because they don't say anything, doesn't mean they don't notice, but are too polite to say anything.