Well, it makes sense that none of the new characters would reference them. All of the major players from that era are dead, and events like the Clone Wars and the Jedi Purge have probably faded from memory. It's the same kind of thing as our treatment of, say, WWII. We still talk about it and memorialize it, but it doesn't impact our current events as much as something more recent would. Aside from Luke, Leia, Snoke, and Kylo, I doubt anyone would overtly reference the Prequels in the new trilogy. That's more for Anthology Films like Rogue One to do--which they have.