Smoking weed, doing drugs, partying, drinking, and being open sexually doesn’t always make you fully progressive or political in anyway. Most of the time that means you just like to party hard. Ted Nugent did all that and he hard right wing. Self described “Progressive” rock people aren’t directly political often time or even liberal. Willie Nelson is a good example of this. Most of these people are often just people who don’t like social conservatism. Economically they can vary greatly on views. Political and social views can be moderate to liberal.
I feel like by this definition of “progressive” we could consider kid rock “progressive rock”. Country music had a similar trend called renegade country or rock-country music. It wasn’t progressive it was honest. Just like how rap is honest, gritty, and blunt. Rap isn’t progressive. It’s depiction of a reality or emotions. It isn’t always a direct statement especially of the political type especially in American music. It is venting and impulsive not always thought out but in an art form. Listen to old Reba songs she talks about getting whored out to a rich man by her own mom for a chance at a better life or Hank Williams JR singing about getting drunk, stoned, and in fights. Rock often seems more whiny and snobby because the people venting and singing in it are usually people from more well off backgrounds. Compare most rocker backgrounds to some rappers and even older country singers. Some of the longest and deepest rock songs usually mix in some country elements especially in the 70s and early 80s.