Pi, i think your forgetting that he comes from a country where the word doesnt have the same weight. Its just another bad word to them. We are the only place that has the baggage that comes along with the use of the word.Pewdiepie knows the weight of the word, I'm pretty sure you'd have difficulties finding people in his age group in western Europe that don't know the meaning of that word at all, let alone someone that is so involved in a US centric community like Youtube..
If you hadn't noticed, this is Forum 2.0