my husband does this to me all the time. I have told him numberous times that it's rude, but his dipping along with wanting to smell my food (practically putting his nose
in my food is just to much) has pushed me to the point where I won't eat my food anymore when he does it. Then he gets upset and i tell him I don't want it anymore. besides he's setting a bad example for our daughter, showing her that she can just take whatever she wants, whenever she wants. If he has something that i want to try I ask if i can have a taste, I even ask our daughter if i can taste her food.