Catherine endorses  the notion of controlling individual behavior that is perceived as disrespectful.  Once that endorsement is made, once it is accepted that individuals must tow the politically correct line, we cannot fault a group for their PC decisions.  If those at the college find sombreros objectionable, who is Catherine or anyone else to object.  The principle of forcing individuals to conform to PC notions as in "black face" is established.  I think most Americans, if asked privately whether wearing black make-up was unacceptable would say no.  The media on the other hand has decided that black make-up is a social no-no.  Not because it is physically offensive but because they feel, what, that whites have no right to enjoy emulating those with natural black pigment?  What the media proclaims often has little to do with what many Americans think.  That is why Trump is popular.  We are tired of the media controlling us.