I don't think it has to do with the curls per se but rather having unkempt hair. A lot of curly girls do not know how to manage their hair. Some straight girls don't either and that's not professional! I know I've gone in with second day hair in the past that looks a mess. As long as your curls are nicely maintained you shouldn't have a problem. My 2 cents.
2b/c wavy modified CG since July 2012
medium texture, normal porosity, normal elasticity
hair likes protein, doesn't like oils, easily OC'd
low poo: JCHCC, CJGCS
RO/co-wash/LI: YTCarrots, DB Pumpkin Seed
stylers: a bunch of stylers that are all pretty much the same (KCCC, UFDCM, CRCM, CKCJ) or ArcAngel if I need more hold
DT/PT: CJRM, CNPF