On the track Fall, which features Justin Vernon, he raps: ‘I see why you called yourself a gay, bitch’ in reference to Tyler the Creator.

‘In my quest to hurt him, I realize that I was hurting a lot of other people by saying it,’ he explained. ‘It was one of the things that I kept going back to and going ‘I don’t feel right with this’.
read more here : http://dquartz.com/eminem-regrets-the-use-of-homophobic-slurs-on-new-album/