Let him portray his faction however he wants. If he posts memes as genuine RP, then let him. Who knows where the faction will end up if he doesn't.
On a more specific note, I'd ask that if you're seriously going for officialdom, then you may seriously want to seriously focus on adhering to some kind of regulatory system. Serious factions, potentially like yours, benefit from looking past the player and at the RP, and it genuinely, seriously helps a longing unofficial obtain official status.
We're also not cardboard cutouts. Sportsmanship is a rarity, but here it counts for something.
