Right--and, at the same time, while age expected or age appropriate isn't an excuse for misbehavior (I still address and work with the behavior) if something is universally associated with a certain age group then it's unrealistic to expect otherwise from your child of that age
I mean, if ALL 2 year olds look at you and do what they've been told not to do then there must be something else going on there than the idea that all 2yo's are evil and villianous and out to get their parents
In fact, if you read about what is going on developmentally with 2yo's it makes total sense that they are doing this