i would very much agree that chinese hamsters are solitary, and P@H are terrible with there hamsters to be honest, the one near me can't even label them correctly, and at one point had syrians labelled as sociable?????? ive seen chinese labelled as rbo's and campbells.
in my experience chinese hamsters do not get on well and its very rare that they do from what i have heard from other breeders. i dont think its bad breeding i think its their natural status as "solitary" its very different to bad breeding sometimes you get certain colours in syrians and campbells like argente which some can have a tend to be more agressive (before the argente breeders out there start hunting me i did say some
)