Now like every Demacian champion is either some asshole or has some super secret, or both.

Vayne and Lux and...that's...that's about it? Unless you count Shyvana's dragon thing but that's not really a secret.

This round of rewrites didn't really change anyone super substantially except for Lux (Swap Military Brainwashing for Secret Wizard) and Galio.

To be fair, everyone is an asshole.

But who in specific are you bothered by? J4 doesn't seem like an asshole much anymore.

Everyone has a secret.

http://vignette2.wikia.nocookie.net/leagueoflegends/images/a/ab/Lux.tauntJarvan01.ogg/revision/latest?cb=20170310092510

This line makes sense only after her lore update. I thought about why would she say it metaphorically.