I've an established theory that most people will try to pull you into a small sub-set of a field or area that they're an expert in, and then beat you silly with their knowledge.

This is particularly brutal if they're ego-centric and doing it to depress upon you "how smart they are".

I've seen this with quite a few "smart" people.

There are two aspects to this:

1) talking "smart" - use of phrases, language, and ideas that aren't obvious, or using terms that are part of "smart"

2) small areas of their own knowledge that you are unlikely to know.

Examples:

friend would pull me into quantum string theory (M-brains, whatever) where they'd memorized certain details of it--they weren't particularly smart on quantum string theory, but I had zero knowledge. They'd keep turning the topic into these areas despite group's conversations not going that way naturally.

another casual friend pulled me into the "A Tribe Called Red is so good" when I started gushing about my appreciation of multi-syllabically rapping styles of lyrical rappers that I liked. They were essentially regurgitating a critic's article on the topic.

Some internal Microsofters a few decades ago would describe that there was internal smart-speak for "smart" identifying people. The same is true in most contexts.