Option not to play with younger players
My experience as a 30+ yo player is that a lot of the griefing and hate from other coplayers and enemy teams comes from players that are pretty young. Although I understand that you want to include all players, I really feel that the younger players are the mayor problem in griefing (but of course I understand that there are older players that are "bad" winners and losers aswell). I feel that it would be great to verify your age viia E-ID and be able to play with an older age group, and be rid with a lot of the teen hormones that makes us all want that last bad game to be the last of the day.
Best regard "S"