The clever erudite tries to make you look like an idiot by asking questions on various narrow topics in which he understands, but you are not. How beautifully "put in place"?

Interesting, but such a technique will not come in handy: if any more or less complicated question arises, call a smart guy (preferably publicly), and say: "There is such a topic ... Tell me what to do. DO YOU HAVE THE MOST SMART?" Do not give evasion from the answer, criticize the received answers and ask tricky questions. To bring the matter to the point that the clever man bored and shut up, not knowing what to answer. Catching on the fact that the answers and advice of a smart guy are pure theory, but he does not know how to implement it (as in the fairy tale about mice and a cat "The idea of ​​hanging a bell on a cat's neck is good. And which of us mice will hang it?) Perhaps, after a few such shocks, the smart guy will stop pestering him?

Why do you give in to provocation?

In general, I can hardly imagine your communication. You meet with a person and then he, word by word, starts asking you highly specialized questions?

I recommend that you simply answer “I don’t know”, “this is not in my competence”, etc. Something not knowing is normal. A person cannot know the answers to all questions.

But if you really want to "put in place", ask him tricky questions about things that you understand, but he does not. And look, by the way, how he will react to it. Because, it seems to me, you will not embarrass him with your questions as he does you.