My picasso/percula's accepted just about ever nem I had over their 5 and half years, but they hated the haddoni, never accepted it.
Not only that, but if my hand was in tank, and the haddoni touched me, they actually swiped and bit at it, it was pretty funny to see, and also interesting was that haddoni was the only nem that ever gave me welts.
They obviously know or sense something we can not.
A maroon would take to that nem, even though not natural.