No, there is no requirement to simply agree. OTOH it helps tremendously when one is well informed, knows how to listen and has some ability to learn. So that's three in Trump's "totally lacking" box.
How ignorant is he? Mentioning that Germany is "bad, very bad" for exporting all those cars to the USA is "dumb, dumber, Trump". No wonder Merkel let him know it was inappropriate. Who does he think creates the demand for the German cars or for that matter any of the other imports. Must be the 50% of voters who didn't vote for him, eh? Or perhaps it is the market at work? Strange considering he has a BS in economics.

Labels: moderation: toxicity, insult