A bad player is not one who is perceived by others as underperforming in duty.
A bad player is the player who criticises the performance of that player and do not offer anything constructive for them to improve.
A bad player is the one who instantly quits from a duty just because they do not like it.
A bad player is the one who thinks it is mature and clever to denigrate others.
A bad player is the one forgets that a game is to be enjoyed by all taking part.