It's useless without context and inflection.
The President could have been snarky and snippy, or he could have been compassionate when he said, "That isn't what I asked you". Just reading the text, it honestly sounds snippy to me in text. But, again, lack of context.
Agreed, context and inflection are essential. I expect I would have been snippy too given the past 6 years. Even so that wasn't my first thought when I read it. I guess it shows we hear what we want to hear when we read these things.
Why do I say that? It is because Webb's THOUGHTS ("I wanted to slug him") were quoted.
Therefore, the President could have said something like, "I know how you feel, but I just wanted to know how your son is doing."
Democrats lie. It is part of their fabric of being.