I don't get the original post...
A personal preference for the appearance of straight hair does not automatically mean a preference for the appearance of straight hair on "white" people.
Not all of us "caucasians" are technically "white" (the word used interchangeably with "caucasian" in the original post) and everybody everywhere has every type of hair texture and color (and eye color).
I don't know who is Laura Wexler (mentioned in the original post), but if she promotes straight hair, as far as I'm concerned, she has bad taste. It's not right to suggest she has bad taste because
she's some racist (unless she said something like, "White people are prettier...". Then she's a racist and who cares what she thinks about hair or anything else?)
Having the bad taste to prefer straight hair doesn't necessarily indicate insanity.