Hmmm the simplest way to knock someone: take what they have accomplished and say it doesn't mean anything. Hey look he's the best audio MC in the world, but it doesn't mean anything compared to being the top scientist in the world in a particular field. It's all relative

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Fee Fi Fo Fum, now bitch I'm a giant
And your ass is like Jack, but your magic beans is wack
Skills is what you lack
I'm like a Benz, you ain't even like a Cadillac
Ya more like a Reagal
I'm a pittbull and you's a beagel