Also, it's not just the emaciated that they hate; in fact, I'd venture to say that they viscerally hate the healthy-weight individuals (within a healthy BMI, especially those in the middle or just below middle of the BMI/lower range)  even more, because we're a stark reminder that health and beauty (as in attractive to anybody regardless of sexual orientation/gender identification) is in that zone.  At least that's been my personal experience.