Do you have evidence that people are? Mostly people advise against it because of the high risk of infection but I am not sure anyone is specifically 'against' it in a 'not only do we not like it but we say you should not do it either' way. Generally, most fetishes are accepted here without condenmation save those where there is no clear line of consent (paedophillia, bestilaity) or where permanent harm (mental or physical) may result (forced breeding seems to have come up recently but also cannibalism has been mentioned in the past).

A lot of people consider scat to be a hard limit because of the infection risk and the 'squick' factor. It is something so against childhood training that it causes a strong response in most people. However, I for one do not deny anyone the right to practise it if they so feel the need.