I don't think he realized that there are 2 federal minimum wages.
Basically any bellperson, server, or valet you met anywhere in the country makes the tipped wage. Some other frequently tipped vocations may actually be at a full rate, but the nature of the position tends to encourage tipping.
Take your hairdresser. If it's a private salon, the hairdresser may not make an hourly wage at all, and may actually pay for the position in the store. If it's a chain, then they probably make minimum wage + commission off of product + tips. It may not seem like tipping would be required, but then again this person has the power to ruin or enhance your public image