It's because he chased away a woman who fell asleep during his performance in Denver. The woman later explained that she had been dealing with many problems since the death of her child and was trying to distract her mind from her grief, so she decided to buy a VIP ticket. But because she was exhausted from work, she fell asleep.
The video made a lot of Americans angry and many decided to boycott his shows. Burna Boy's reactions on his Instagram story made the situation even worse, until he finally admitted that he was wrong.
However, according to others, the footage showing empty seats is fake, AI-generated and/or taken before the show started