I think some of the Haflinger bashing may have to do with the fact that in some areas they are kind of a “fad” breed at the moment. In my area, there are multiple Haflinger breeders who really don’t handle or do much of anything with their horses but still try to sell them for outrageous prices (that would get you a young, decently started, sound Quarter or other stock type horse who is equally likely to be a nice all around type). Eventually, they overbreed, end up with too many horses to care for and dump a bunch at auction, further reinforcing that the horses are value-less.
I grew up in an area where Haflingers were much less common and the ones I met were very well trained and handled and overall, very cool little horses. I can definitely see myself owning one of the lighter built/sportier ones some day and think its a damn shame that around here (rural IL), they’ve come to be associated with being unhandled/poorly trained.