Here's UD:
"When used in online political language it can mean 'based in fact' or the opposite of biased due to the number of people who saw it being first used seriously by the online political right and came to the conclusion that is was related to the phrase 'destroyed with facts and logic' in reference to right wing personality Ben Shapiro."
Uh, I dunno about the last part. So my basic take would be:
"Conservative, rational/non-emotional, down with reality etc vs I dunno 'un-based' 'debased' 'lunatic' etc libs that are, well, anything but 'based.' And I'd say MAGA vs RINO/regular-still-watches-Fox Republican. Ha, that's probably a good metric - still watches Fox? Not based."
Your go.
Based means not swayed by the whims and fake weather conjured up by the Fake News each day. Not taking anyone at their word, researching the truth, always following the money and finding the motives. Based is REAL, NOT swayed by BS talking points, based is breaking down your weapon and putting it back together like an armorer.