Peter Bart and Mike Fleming Jr. worked together for two decades at Daily Variety. In this weekly column, two old friends get together and grind their axes, mostly on the movie business. BART: Talk about culture clash: You just got back from Cannes, Mike, where attention is focused on Carol and Cate (Carol is the movie about lesbian love and Cate is its star) and I am in Las Vegas, where people are trying to figure out what happened to all the gamblers (gaming now accounts…