根据上下文来，这里的 may 应该是表示推测。段意：
In India and the Middle East, it’s considered very rude to eat with your left hand. People in France expect you to eat with a utensil in each hand. Mexicans consider it inappropriate to eat with utensils, instead preferring to use their hands. In Chile, you may never touch any food with your fingers. People in Thailand generally use their forks only to push food onto their spoons.