he clearly answered this... when you get around white people, who he feels are a different class, he switches it up and gives them the "white voice"
i'll give you an example... you answer the phone for one of your boys and have a convo about the club last night.. is that the same lingo and PITCH you'd use to answer the phone at work and talk to the CEO?? nah you'd lighten it up. well most people do.. just listen to how they sound on their voicemail vs. how they sound when they talking to you on the block. it's called a professional voice
why kanye feels the need to do this at this point in his career.... that he never answered... but apparently he's doing it now