Why is baseball the only sport where they only congratulate themselves after a game?

After a professional baseball game, the players all congratulate themselves, much like in other sports they wish the other team a sportsmans job Cheap Viagra well done, some thing like "good game." Now in amateur baseball it is not odd to see the 2 teams line up for a handshake, but why is it that in professional baseball, a sport that is considered to be a ‘genuine’ sport, they forget the sportsmanship and simply congratulate themselves?