In an interview, he told his story wasn't racist on purpose ; he truly believed that was how black people were based on the very few informations he had at the time - he never traveled outside of Belgium.
When he made the next one with a chinese person, he contacted a student who was originally from China to educate himself on how Asia really was, the culture, the people, etc. And that's how he came up with one of the best books of this career.
>Hergé met Chang Chong-Ren for the first time in Brussels in 1934 at the urging of one Abbé Gosset. Gosset, the chaplain to a group of Chinese Catholic students at Louvain University, had been concerned about the racist stereotypes in Hergé’s first two hugely popular Tintin books, Tintin in the Land of the Soviets and Tintin in the Congo, and urged him to ‘do a little research’ before embarking on his next book, The Blue Lotus, set in China.
This was the one Tintin my mum wouldn't let me have as a child - at the time I thought it grossly unfair, and argued that surely she could just point out the aspects that were offensively racist the way she'd point out problematic aspects of anything else she might read to me / introduce to me to read myself.
I don't remember the specifics, as it's the only Tintin story I've only read once rather than many times, but when I did read it in my early 20s I immediately told her that I no longer disagreed with her decision to keep it out of the hands of her children.
I think adults can manage reading things they disagree with and consider inappropriate.
people literally watch horror movies.