It's dumb fun but I don't think it's racist unless actual Ugandan people consider it as one. Kinda like the H&M scandal where people claim it's racist when it's just as possible that H&M did not equate monkeys to black people. FFS the kid's mom even said that the media should stop talking about it lol.
Re the H&M people it was kinda stupid to do so and I don't think the text on the shirt was fun at all regardless of skin colour.