'You've got crap eye sight ref'
I don't see OFFINABUS in this. It's a yellow, definitely, but I just don't see a red card here.
My youngest red card is U/11, and I've given a few at that age - but that's in Futsal, and at the nationals, and they've all been very clear cut (DOGSO, or 2 yellows). Outdoors, I've given a few at U/12, don't think I've had U/11. U/12 has been for a range of offences.
I'm far less tolerant of dissent, aggression and deliberately unsporting behaviour at younger ages than older ages - but I guess my philosophy on cards is that they shouldn't just be for match control only. A yellow card sends a message that a stern word can't - particularly if it's the sort of player who knows he can get away with a lot. And some young players are like that, and they start to learn that a word is essentially meaningless. But a card? That's scary - I mean, who gets a card at this age?