My friend has a sick mind(PLEASE ANSWER, VERY IMPORTANT)?

I was reading info about 3 guys and 1 hammer on wiki (its about 3 guys killing a guy with a hammer), I did not dare to watch this video, i have a strong heart but i would get really sad and really angry if i watched a poor man getting masacred, My friend found a link of it and watched it and he really enjoyed it, He said that he wanted to be like them and he said that he didn't feel sorry for the man that got killed and he was laughing, I dont know if he is for real or he is joking, if this is his idea of a joke than he really needs to go to a psychiatrist, Tell me what should i do, should i continue being friends with him or not, im 18 and he is 18 were both adults, this reaction of his got me angry and i got very repulsed, PLEASE ANSWER THIS, ITS REALLY IMPORTANT, IM GETTING SICK OF THE WORLD I LIVE IN