Why should it be divisive at all? Like when fans were in an uproar when the Titans cast a black woman to portray an orange alien from Tamaran as not being reali

Why should it be divisive at all? Like when fans were in an uproar when the Titans cast a black woman to portray an orange alien from Tamaran as not being realistic? I’m surprised their wasn’t uproar about Will Smith playing a blue genie.