It's not about sharpening your wits thorough osmosis, it's about seeing nonsense laid bare at your feet. Leveraging that to see through the pretense of "smarter" conversation to understand it's the exact same stuff: shit-flinging, misleading but plausible half-lies, active propaganda, underinformed dummies thinking they're having a deep conversation, etc...
The zen that parent poster describes comes when you recognize that your favorite political commentator, or the thing your best friend just said over coffee are not inherently smarter or dumber than 4chan.
edit: w/r/t "leaking outside.": The problem isn't that Trump was meme-ed into the whitehouse. The problem is that paternalistic control of messaging will never equip the populace to evaluate something as nonsense when the parents aren't around to stop the message from propagating.