Oh, don't get me wrong: I really like useful information like the one in the CGP Grey video you mentioned, and also things like regional/cultural information that is part of "shared culture". Same for things like TV shows or music or old kids shows... Those really don't bother me. Shared culture is important!

But the things I'm complaining about don't really become part of "shared culture". They're more like temporary "memes" that people use to show off they're interesting. Which is perfectly fine, we all do it! But the issue for me is that those little trivia tidbits that people are using are repeated so often that they start to irk and people look deeply uninteresting. :(