i personally still think its not very good sportsmanship. yeah you may have mad at them, yeah they may have been playing dirty, but thats when you show that YOUR the better player and the better team. You still shake their hands. Shaking their hands doesnt mean your saying "hey you guys played great good fight blah blah great job" it just shows good sportsmanship. i dont know how many times i had to go shake a girls hand after our soccer game when during the whole game, she'd be pushing me down and tripping me and taunting me. but i still had to. and i still did, and it showed that we had better sportsmanship (i wonder how many more times i can say that haha) than the other team.