"Pimp" as a slang term originally was black slang. But "pimp" as a word referring to someone who manages pimps (the male equivalent to a "Madame") has no particular reference to blacks. It dates back to the 17th century, though the preicse origin is not known.

One sourece:

1607, perhaps from M.Fr. pimper "to dress elegantly" (16c.), prp. of pimpant "alluring in dress, seductive." Weekley suggests M.Fr. pimpreneau, defined in Cotgrave (1611) as "a knave, rascall, varlet, scoundrell." The word also means "informer, stool pigeon" in Australia and New Zealand and in S.Africa, where by early 1960s it existed in Swahili form impimpsi. The verb is attested from 1636. Pimpmobile first recorded 1973.

A totally different origin is suggested by a Legal Encyclopedia via Ask.com:

In feudal England, a type of tenure by which a tenant was permitted to use real property that belonged to a lord in exchange for the performance of some service, such as providing young women for the use and pleasure of the lord.

An individual who, for a fee, supplies another individual with a prostitute for sexual purposes. To pander, or cater to the sexual desires of others in exchange for money.

May I suggest you do more research before getting into a huff.