Oh, it's fake... Sorry, it just looks so realistic and it freaked me out... ever since I learned that teenagers around the world are self-harming these days, I've stumbled across it numerous times. It really makes me cringe.
Even if it was real, your response was childish and ignorant. I used to be a self-harmer, and the fact that all you could say was that it "sickens you" just baffles me. I think maybe you should do your research, and try to understand the kind of anguish that's behind self-harm.