You are in a band which is pretty good...except for one of the players, who really sucks.

WTF has that got to do with equality? Equality means equal pay for equal work. The one who sucks has obviously not done equal work.

Does that person need to practice more and work their asses off to keep up with the other players

To fucking true he should. Either that or piss off. Pretty much like your lame efforts, Goofus. You need more practice but please do it in private and stop annoying the grown ups.