They just don't like the IDEA behind Wakanda, their stance against the West sometimes, the name, 'black panther' and how they don't usually allow people on their land (white love the idea of going to any land and taking the shyt over)... plus it makes it seem that Storm is ACTUALLY aware of her blackness and not the black sideline bich they want her to be.I'm positive that's why it was done. You'd be surprised by how racist some X-Men fans can be about shyt. A lot of them complained from the moment the characters were put together and still haven't stopped bytching about it. They were saying the couple was racist because both of the characters are black
Then they find out that Challa and her have known each other before she was a hero and it feels like betrayal to the average white reader- as he was smashing her as a teen. .