Her picking on one body type to make her point about diversity on Vogue covers was ironic. Diversity would mean that all kinds of body types get the cover.
Picking on red-heads seems a wee bit cruel. In Britain, red-heads are deemed "ging-ers," and such epitaphs are part of a long history of ethnic defamation against people with the audacity to live on land coveted by more powerful blondes and brunettes.
No harm was meant, but it might be something a commentator on diversity would consider the next time she's looking to make an example.