(Reuters) -Joe Rogan, the popular U.S. podcaster, issued an apology for the second time in a week, this time for using racial slurs after a montage video surfaced showing him repeatedly saying the N-word. In an apology video posted on Instagram on Saturday, Rogan said it was the “most regretful and shameful thing that I’ve ever had to talk about publicly.” During the video, Rogan said footage that emerged of him using the epithet had been taken out of context, but looked “horrible, even to me.” Rogan’s apology came after Grammy award winning singer-songwriter India Arie pulled her music from t…