I kinda think I know what you're going through, my son has PDD and he was like that for a long time - no rules, hated loosing, even when we played Mario Party, if he lost during mini-game, even though his team was in overall lead, he had emotional outbursts.
Now he's 9 and more capable of dealing with defeat, so I let him play with other kids online - unfortunately, I don't have WiiU yet, so can't say anything about Splatoon.







