Why do people talk at restaurants when they eat dinner?

It makes me sick. I was raised to everyone being quiet at dinner. Nobody talked. If my father talked my mother told him to be quiet, if my mother talked my father told her to be quiet. That's just the way I like it. When I see people talking at restaurants and using manners, it makes me annoyed. I get very annoyed by people who are too polite. They seem evil to me. Who cares what fork you use? Who cares if i'm drinking my soup instead of using a spoon? Common mannerisms and politeness are necessary of course.