FRC, it's a good point, though. :D What about rephrasing it? Maybe, :D
If a person shuffles their feet, it doesn't necessarily mean that person is shy. It could have to do with physical factors, such as a bad back or the type of shoes the person is wearing (e.g., thonged sandles, slippers).
By the way, I can relate. I live in Japan and slippers are the norm at home and at the office, especially if you are a guest. I've never been able to walk in guest slippers, especially the pleather ones (i.e., plastic-leather, fake leather). My feet slip and slide; I always seem to lose one or half-step out of the other. (There's just no toe-grip in slippers or maybe it's just me that hasn't yet figured out the Art of the toe-grip.) The best I can do to keep the pleather skippers on my feet is to shuffle from one business meeting to another. It slows me down, a lot, but I get there just the same.
When you've taken as much bashing as the French recently, political correctness looks like a pretty abstract notion. That was a dumb post that could offend people, but let's keep using "human dignity" for more serious business.