For anyone who doesn't, it seems to be a reference to the upcoming Paper Mario game, Origami King, having no experience system, and the perception that fans who enjoy the old Paper Mario games (64, TTYD, and sometimes SPM) hate the new ones (Sticker Star, Color Splash, etc.) irrationally. Whether or not the twitter user actually hates said fans, I'm not particularly sure.

I'm gonna give them the benefit of the doubt and assume it's just a light-hearted joke at the fans' expense, like most of the other posts in this image gallery, but I could be wrong. As a fan of 64 and TTYD myself, I actually think it's pretty funny.