The 34-year-old rapper was the headline act at the U.K.'s Big Chill music festival Saturday night, where he ranted in the middle of his set about being misunderstood and underappreciated.
He says, "I walk through the hotel and I walk down the street, and people look at me like I'm (expletive) insane, like I'm Hitler."
He received light boos from the crowd.
West, who started his set roughly 30-minutes late, apologized to the crowd for his tardiness, saying he needed to make sure his performance was great.
The multiplatinum-seller is known for his outbursts, most notably his diss of Taylor Swift at the 2009 MTV Video Music Awards.