The use of the word "genius" is often debated; some feel that the potency of the word's intended meaning has been diluted by over-usage. The history of Western music has included many talents who pushed the boundaries of what audiences thought possible at the time, such as Wolfgang Amadeus Mozart, Ludwig van Beethoven, Charlie Parker, Miles Davis, John Cage, and many more. These artists might be considered geniuses today for their effect on music's direction as a whole, so to judge a current artist's level of "genius" might be difficult before their discography is complete and the total effect they have on artists to come can be fully appreciated.
In Kanye West's specific case, he's called himself "a God" (even releasing a song in reference to this claim), and has also self-identified as a genius on multiple occasions. His arrogant attitude has definitely led people to question him, but putting that aside, what has Kanye accomplished musically? The gold standard of awards in the music industry is the GRAMMYs, of which he's received the seventh-most in history. As of 2019, Kanye has won 21 GRAMMYs from 69 total nominations.
On a side note, this Community Manager definitely thinks Kanye has the gifts to be considered genius. His understanding of production and the ways that he's explored the possibilities within music production is truly new and innovative. I look forward to new releases of his always, because he continues to push his own boundaries and release music like I've never heard before.