Eating with others is not just about satisfying your hunger. It is a SOCIAL ACTIVITY that requires polite behavior so everyone can have an overall positive experience.
What do your table manners say about you? How do you assert your needs to others at the table? To those serving your table? What are appropriate topics of conversation?
As with everything you have practiced so far, it always comes down to kindness, consideration and respect for others. You never know who you might have the chance to dine with in the future, but anyone you sit down and have a meal with deserves these, at the very least.
Consider the consequences of being rude and inappropriate at the table:
You are unlikely to be invited to a meal again
Embarrassment for yourself and your family
Making everyone at the table have an unpleasant experience
Burning bridges for possible important relationships in the future