I grew up with pretentiousness like this. Lot of upper middle class twits who wanted to be upper class. I used to get their goat with a kind of backhand kindness.

“You know about ABC?” Where ABC is a question about a topic he claims to be an expert in.

“If you don’t know how to ABC, you aren’t very educated.”

“Ah, I see you don’t know either.”

“I never SAID that! But I have neither the time nor patience to explain it to you.”

“Let me ask around, and we can find the answer together.”

“I KNOW the answer!!!”

“Not well enough to explain it, though. But that’s okay, we can learn that to. Let’s ask this guy. Hey, my colleague and I were wondering if you could explain ABC…”

Oh my god, this makes their pompousness positively FUME with rage.