As a fellow swede, I can understand why this was particularly rough for him, as he most likely used it just like many of us used English curse words and slurs very casually when we were young. They weren't words we understood, or knew the history of, and parents/teachers didn't really stop us or teach us when we heard them. We knew they were said in media, on TV and in movies, so we picked it up without much regard for meaning.
So for him to slip out an N-word is unfortunate, but definitely doesn't make me think he's racist or anything. Just like my friends and I who grew up using bad words like this, but we all grew up to be progressive and accepting of everyone. It doesn't have to reflect anything within PDP himself, even though it's highly offensive to the audience hearing it.
Just very unfortunate for everyone involved.