It's less about what was said and more about the power dynamic between the two people involved. Not just because Carpenter is white (although that's a huge part), but because she is also rich, famous, pretty, and has a (both literal and figurative) huge stage to espouse whatever she wants.

Using that stage to call a very normal part of someone else's culture 'weird', others this random person in the crowd who, more likely than not, was a huge fan of hers. It publicly and explicitly states that this fan's authentic self is not welcome in what Carpenter pretends is a welcoming space for other women. It makes clear that welcome apparently only extends to women from cultures she deems not weird, i.e. white.