To me it seems clear this guy didn’t actually know the answer to your question and his ego was too large to just say “I’m so sorry I don’t have a great answer for that but I’ll introduce you to Professor Yada Yada who can better answer that”. I’ve had similar experiences within the medical community where a doctor’s ego prevented me from being able to find someone who understood and could genuinely treat a chronic condition I have while simultaneously making me feel like utter shit mentally. Realizing this person’s ego was too big for them to just admit that they don’t know the answer alleviated a lot of the self-imposed responsibility surrounding the situation.
Basically this guy is a narcissistic asshat who’s also an idiot (the worst possible combination of traits). Your question was genuinely a good and thoughtful question. The burden of this failed interaction is on him, not you.