I don't know how to make my kids stop fighting and calling each other names!

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My kids fight all day long, every single day. They never get along with each other. I separate them and they call each other names from different rooms. Yet, it doesn't take long for them to start fussing at me about letting them play together again. I know that siblings are going to fight, but it seems like mine do it excessively. They are 3,4,6 and 7 and all you ever hear is, "stupid" "dummy" "idiot" "big head" "big mouth" "crybaby" "tattletale"....they'll race each other down the hallway trying to to be the first one to tattle. I eventually get tired of listening to them and put them all in separate rooms. Even when I do that, they yell across the hallway at each other. "This is your fault!" "Now we're in trouble because you have a big mouth" "Mommy! He's making faces at me!"....it's so ridiculous that it's almost comical. I remember when I was a kid how much my little brother and I fought. We were always calling each other names and fighting to the point my mom got so tired of it that she soaped our mouths out and would send us to our rooms for the entire day. I don't use the soap with my kids, but I threaten to put hot sauce on their tongues. And even sending them to their own rooms, with their own toys and no one to have to share with, they still fight through the walls and across the hallway. I don't know how to make them stop. I close the doors, but someone always has to go to the bathroom or get a drink, and my two youngest don't like their doors closed. You would think that as close as my kids are in age that they would get a long a little better, but they don't! And I know they pick this name calling crap up from school because they never did that until my oldest started kindergarten and she brought it home to the younger ones. Now 3 of the kids are in school and that's all they ever do is call names and argue. My husband and I never talk like that, especially in front of the kids and we don't have cable so I know they're not getting it from TV. Does anyone have any suggestions? I can't take it anymore. They're driving me nuts. I want them to get along so they don't have to spend so much time alone. They're siblings and they are going to be forever, I want them to love and respect each other. I expect fighting here and there but they do it constantly. I'm open to any and all suggestions. Thank you.