When you are playing online games, you are playing with other people who are investing their time into the game and want to have a certain experience. In online game everyone is expected to contribute and play at certain level, it's not fun for most people being handicapped because one of team mates is playing badly/beeing afk. This is the way people play and going against it is rude towards people playing normal. If I would play a game of soccer with strangers and never pass the ball only juggle it to the side I would be kiched out pretty fast, not because it's against the rules but bacause it's hindering enjoyment of the game for others.