It's unfortunate, players like this just never learn. The toxic attitude plus blind delusion about their skill level is one of the worst combinations out there. This guy claims to be the world's greatest dancer but somehow manages to deal only 800k damage over the course of the aminon fight. Also reporting his "best" kill time of 7 minutes on hard mode as if that's any kind of achievement... good groups kill that boss in 5-6 minutes consistently on hard mode. This guy can barely do a sheol C run without wiping on the first 2 floors repeatedly.. 7 mil on WAR is also pretty pathetic (if he can even manage that), especially when you consider that he bought R30 nyame. These are numbers closer to a BRD or COR in a normal run.
Maybe if they added Visamancer as a class he could perform well but from what I've seen on all his other jobs, his "best" is still a hard carry. Maybe if he joins your group he will pay you to log onto his character and play for him, so that's a plus (as long as you have tight security in your local parking lots).