I decided to make a list of my headcanon reasons why the “Poopie Baby” trope exists in universe. This is just a basic outline for some of my headcanon so I could put my thoughts down in a more organised manor
Reason 1- Fluffies are designed to be prideful creatures and occasionally pick a Bestes Babbeh but this selection is a benign one and in a perfect world the effects of this hierarchy would not cause any problems, as while Fluffies are prideful creatures they were designed to love all their babies and the idea of harming their own foals is a foreign concept and one a fluffy could not conceive of on it’s own.
Reason 2- After the Fluffies were released and many became feral, as a result this hierarchy became more and more pronounced as mares would have to delegate which foals were most likely to survive and thus receive the most milk.
Though the designation of “Poopie Baby” is not solely based on colour and varies from mare to mare
Though this is not done out of malice (except in very rare cases) and is born out of Fluffies living in a world they were never meant to inhabit. However many people are unaware of this and coupled with other misconceptions means that they sometimes act violently to the mare thinking that is being cruel to the foal
Reason 3- the most prevalent reason behind the “Poopie Baby” and where the term “Poopie Baby” originated from as it was simple enough way for the mare to understand the “bad” colours as a negative trait in foals was not something the Fluffies themselves came up with, and was a result of the numerous poorly run mills that would incentivise (usually violently) breeding stock to cull or at least ignore any foals deemed to be bad colours by management.
Thus as more Fluffies are raised in this cold uncaring environment many mares would either consciously or unconsciously teach their better coloured foals this attitude, these maladjusted foals are then sold to the public where they then breed and this vicious behaviour becomes more of an entrenched part of the Fluffies personality