Ds 7 playing on switch. 2 yr old cousin next to him eating something. At some point, 2 yr old has gotten up and gotten hold of something and caused it to spill. Nobody hurt, nothing broken, although I don't know what it was that spilled. Ds step granddad has come into room and blamed and shouted at ds for not watching cousin and stopping her and said 'ds always on game and he pities me'. I am fuming as I think it was a totally inappropriate way to talk to my ds and want to confront him. Have spoken to sis and she doesn't really see an issue with what happened/was said. Aibu and it's not a big deal or ynbu and I should be upset and confront?
For context, ds has parental controls on switch that is set for 2 hours max per day so absolutely not on it 'all the time'