So me and my friends we on our 4th meeting of playing D&D together. We were all having a blast, our DM was going a wonderful job, there were laughs to spare and enjoyment was bountiful. So on and so forth we played (and I will skip the specifics) but one of our players decided to try something nearly impossible that would cost half of our adventuring group to fall many turns behind. He attempted and failed even after we asked him multiple times to not do it and even used diplomacy checks to try to convince our NPC to stop him. They checks failed and he failed as well. So after this he got onto his laptop and got onto Facebook and stopped talking. We ignored the fact that he was fuming and continued on with the adventure. He said nothing but he took his turns regardless. Then when we had finally caught up one of our friends was at 1 HP on top of a giant moving stone beast. No you could currently help him but Mr. Silence. But he had another plan. He was going to go to the otherside and try to climb up instead of healing Mr. About to Die. So I said he is going to die if you dont heal him. He then proceeded to throw his stuff off the table shut his laptop and rush out without saying anything except, "I am done!" The rest of us were talking about it afterwards and one of our adventurers and our DM sided with Mr. Silence saying that he was role playing over gaming. Here is where the question lies. Role playing V.S. Enjoyment. As soon as he made that mistake he began fuming and the entire mode changed from laughter to akward silence. Then as it continued on it stayed the same. Then he again wanted to put our group further behind and we tried to stop him. Now they were saying he was roleplaying and that we should have let it be. But my roleplaying was, "Hey! Don't let our friend die!" So how was me asking him to help out our group wrong? Wasn't I just roleplaying? Or should we stop sacrifice a portion of the game so that we can continue to enjoy the fun that we are having? So that is it. Role playing V.S. Enjoyment. I really don't know which one should be of higher importance in the world of D&D so that is why I am asking.