If I'm thinking soccer the very last thought would be sportsmanship; especially if I consider the fans! I can't say I've ever seen what you described.
At all competitive levels of soccer if a player is injured in the play (not half a field back without an influence on the game) the team with the ball will kick it out of bounds. The team who then inbounds the ball will return it to the team who gave up possession. Sometimes by a direct pass, sometimes by kicking it back to the opposing teams goalkeeper and sometimes by passing it in and then kicking it out themselves, depending on where in the field of play the outage occurred. Rarely and by rarely I mean my son's HS team still talks about the time it happened 4 years ago, does the team not give the ball back in such a situation.
I would hate to think that the sportsmanship of some fans would taint the game, because I would have to say some of the things I have seen from some softball fans and coaches would turn me off the game.