Sitting down with Peter Rosenberg, Cipha Sounds, and Ebro from Hot 97, Mac Miller discussed the whole idea of "white rapper beef."
Despite Ebro trying to egg him on (lolz), Mac dismissed the idea of any beef between him and Macklemore. Instead, he simply explained that Macklemore is a nice guy and that most white rapper beef is unspoken and comes simply from the idea that there can only be one white rapper at a time.
This is very typical of Mac, who can often defuse any situation with a carefree charm and disarming candor.
They went on to discuss a whole gang of topics, but peep the first eight minutes or so to see them discuss the idea of beef.