Why is it so irritating to be touched while eating?
In any event, there’s nothing wrong with you feeling irritated by being touched whether while eating or any other time. What you might want to do is find out why you feel so uncomfortable. Did you have a sibling growing up that bothered you a lot during meals? Do you feel possessive about your food for some reason? Do you just not like being touched at all?
It also depends on who is doing the touching. If you feel uncomfortable with your significant other, there may be an underlying distrust that you need to address. Often our immediate reactions reveal much which our conscious mind has yet to acknowledge.