The issue with wet markets isn't the sanitary practices of their workers so much as the fact that meat and other food is handled in very close proximity to live animals being slaughtered, and this combined with a large volume of foot traffic. Granted, I haven't seen all episodes of Kitchen Nightmares, but I've never seen slaughter of any kind taking place at a restaurant in that show, let alone at a restaurant that is visited by tens of thousands of people each day.