I have a theory and as usual, it’s oversimplified.
Eric Harris referred to himself as “Reb” which was short for Rebel. Now I couldn’t find anything in the web to suggest why he picked that as his alias. I’m sure the multitudes of mutants will let me know if there is a reason. Anyway, Columbine High School’s sports teams are called The Rebels. So my question is this. Why would Eric Harris name himself after something he hated so much since he allegedly hated the school and the jocks? Therein lies the problem. I don’t think he hated the school or the jocks. Like I said before I don’t think Eric Harris hated the jocks because he was allegedly bullied by them, which he wasn’t, I think it’s because he was jealous of them. He wanted to be them so bad it hurt and when they wouldn’t accept him he snapped. Outside of being a psychopath and a coward this also makes him nothing more than a jock sniffer.