I see some disciplinarians feel this behavior isn't acceptable. But I see a three year old trying his best to formulate a credible argument without resorting to emotion or tantrums. He's trying to solve an issue with words. I've done the same with my son, it's trying at times, but he's in college now, pursuing a criminal justice degree and a straight arrow. He's a great guy.
That little guy is gonna find himself a way to convince and impress his way into getting what he wants. Sales, Law, Teaching. I see it. 3 years old? Pursuing that argument on his feet without plomping down and wailing? C'mon. He's remarkable.