Or they are just trolling it because of it pooping while doing their silly yukkuri statements, like "Cute/Great -yukkuri name- is doing poo poo!", which would be like if Dogs announced them doing their pissing and shitting in public by barking in the middle of it for no apparent reason.
Besides, kids are easily impresionable and like to pester stuff, and yukkuris are weird things that could easily call their attention, aside of being easy targets for pranks and such, even if it's rare the case on which verbal abuse is so effective as to make them freeze in the spot and cry, though maybe using a chldish style of verbal abuse can be quite effective on yukkuris?
Lol, we need more childish teasing like this. Psychological abuse ftw ! Though personally it been funnier if they called her a "poopoo head", for obvious reasons.
Dunno how going to parties and probably doing some shit under the effect of some substances had to do with a stupid talking manjuu shitting in the street while announcing it like a an acomplishment as a daily basis thing with no substance to blame for.