I really don't know why they think that. If anything, the AFC is just more competitive, so you see more scrappy conference games and what not. I think the NFC just got louder fans and are mostly the bigger markets in the league so they get covered more.
I mean, you got Falcons fans who think they're gonna win the ship every year no matter the sport. Cowboys fans who...well...pretty much the same thing. The biggest market and some crazy history with the Giants. Them you have the Niners as well with great history and a huge market. They get covered more and talked about more. Better, tho? Lol nah son