The CMA's happened last night, which means the world's biggest country stars assembled in a room and congratulated one another for being great. But not everybody thinks so. Jimmy Kimmel rounded up Nashville's finest for the latest edition of "Mean Tweets". This time, it's Luke Bryan, Tim McGraw, Darius Rucker, Kacey Musgraves, Willie Nelson, Hunter Hayes, and Carrie Underwood who get so burned. Two things of note here: country music stars have a great sense of humor, and country music stars have really cool hair!