Players who intentionally steal xp from junglers

Yeah...leash the first. ..help a few after...but after repeatedly stating I no longer need help and the support was needed at bottom lane with his ADC...the fool still followed me like a plague and farmed all my jungle monsters. He would warp back to base at the same time just to keep this up. While I was level 3 everyone else was around 5 to 7....after calling him out on his intentional sabotage of me, his team member, this individual decided it would be fun to spam ping all over the area of the map I was in...while still following me. I have never wanted the use of friendly fire to get rid of a team member before now. ...I'm still a bit new and trying to master the use of my Champs in different roles...had quite a few foolish losses upon the back of my own poor skills. But.....this incident was an extreme failure on my part where I was not at fault. I literally was trying to get away from him and kill what I could fast...but even with smite I got only a few if any with him around. I reported him but I wonder what the chances are he'll get banned? Has anyone else encountered players doing this? Greed killing junglers monsters to gain xp faster to have a better score? Pure hate or trolling? I just can't understand it.