As a white person I’m definitely not the one to say if that’s bad or not - but yeah that would be 100% a teaching moment - because I am not aware of anything like that. Instead of slamming down the hammer of “most offensive thing I’ve ever seen” for what I can only see as a fan poster that’s mimicing one that already exists she could have said something like “I understand why they did this, but here is why I disagree with it”. Personally as a fan of wicked, I was disappointed by the poster. Not enough to make my own, but the original poster was iconic to me.