Yeah, from the way my son used to carry on I think you need to be very aggressive sometimes playing those games. I'm sure it's all just part of the rough and tumble of things but if it upsets you like that then why bother doing it.
Do you have a few friends that you could play with that you know aren't going to be nasty? Otherwise, like Bob said - what's the point? Doesn't sound like much fun to me.