In the degraded substandard dialects written on bulletin boards, "elitist" is just another insult. A shorter form of "you seem to think you're better than I am, I think you're mistaken."
Interesting that "snob" isn't much used. Moi, je suis tres snob. I wear a Casio diver's wristwatch instead of a Rolex, look down on the ignorant fools who wear Rolexes in the hope that wearing a Rolex will impress such as me.