Preheat oven to 350°F. In a very large bowl, beat butter with an electric mixer on medium to high speed for 30 seconds. Gradually add sugar, about 1/4 cup at time, beating on medium speed until well mixed. Scrape side of bowl; beat on medium speed for 2 minutes more. Add eggs one at a time, beating well after each addition. Beat in red food coloring and vanilla. Alternately add flour mixture and buttermilk, beating on low speed after each addition just until combined. In a small bowl, combine baking soda and vinegar; fold into batter. Spread batter in the prepared pans.