Ok, THIS I can absolutely believe. What I was questioning was the idea that it's the puritanical crowd shaming people for their one night stand fics.

OTOH, I have no doubt that disgruntled asshat shippers would take issue with fics (literally any fics) that "break up" their OTP. Just not for puritanical reasons.

Though I guess if they're trying to make their objections seem more legitimate by claiming it's about "sexual morals," then I can see why one might call that purity wank.