Let them infodump and smile and nod, it's all you can do.

I did (briefly) play some Magic and I absorbed some Yugioh by osmosis through my spawn watching the anime... and I'm fairly certain that Pokemon was once also a card game and maybe still is...

Humans like us some complicated things. I honestly stopped at D&D. I can handle D&D... but ask me about my Bugbear Cleric or Tiefling Monk and I could go on for HOURS.