The word "customer" already has negative connotations. For example, see Jay-Z's song, "You're Only a Customer," where the hook exclaims: You're only a customer

The word "customer" already has negative connotations. For example, see Jay-Z's song, "You're Only a Customer," where the hook exclaims: You're only a customer (uh) Walkin' in the presence of hustlers You spend money all night long "All night long."