I think the way coco melon is it's so overstimulating that when not on can cause children to struggle when their surrounding aren't as similar
It could be cocomelon as it is known to be overstimulating but it also depends on the interaction of parenra/carers as tv with no interaction causes problems. However it is also normal toddler behaviour. They are learning boundaries and learning to push them. They are learning how to be independent and to argue. They also have the attention span of a fish and will concentrate on things for 1 to 5 minutes before moving on. My daughter is 2.5 and she still flits from 1 task to another. She spends anywhere from 1 to 10 minutes on things. She also can have 10 meltdowns a day or 0. Or more. She is headstrong and independent. Our friend has a 15 month old and any time they say no he throws himself on the floor screaming. So I would say you are experiencing normal behaviour x
To be fair, Coco Melon has been shown to cause behavioural issues in babies and toddlers, so it could be connected to that