If someone started grinding up those pill things and putting them in your salt shaker, you wouldn't be able to prove that you didn't like the results - unless we can believe self-reports.
Believing swlf-report for an n of 1 question of personal preference is very different from trusting a self-report survey meant to extrapolate the results of one cohort to a larger audience.
Sex-segregated spaces for one. For another, is anyone obligated to call a Catholic priest "father" simply because his beliefs give him a special title? Of course not. Clearly gender is not treated this way.
