Short version
MIL is toxic.
Her responses to everything are always negative, example "we went somewhere nice today mum, it was lovely. We should go when you are free" Response "too late you have already been and left me out" but it was a time when MIL is always busy so would not have been possible.
Child is being bullied by cousins (MIL grandchildren) MIL advice is to get our child to go on social media/Roblox/YouTube etc so they can relate to their cousins more.
Driving home from family meal and 2nd youngest child is chatting away to us. MIL declares they are distracting and need a tablet in the car to keep them entertained.
To confirm, none of our children have tablets etc and this is not something we would have. Cousins are screen kids at all times, constantly.
Rant over, so question is AIBU to ignore her advice and just carry on.