Before I bought my latest trail horse, I went and looked at a stunning black/white pinto gelding. The owner was a Parelli person and showed me all the wonderful things he could do on the ground.
He lunged without a rope to voice commands, hopped into the horse trailer great, etc., but when I started asking about how he rode, she was more interested in showing me his ground manners.
Now don't get me wrong, ground manners are GREAT, but if I had to choose between a horse that rides great and a horse that has great ground manners, I would choose the horse that rides great.
Anyway, she was "iffy" about whether or not she thought he could be ridden alone, but he was stunning and was just what floated-my-boat, so to speak. So we set it up for us to ride together so I could test ride him. She canceled out. No problem, we set it up for another time, she canceled out. She said his shoes needed pulling and his feet trimmed. I offered to do it. Afterall, that would be a great way for me to get to know the horse.
None of that ever happened and I gave up on the horse and started looking elsewhere. I honestly think he scared her and she was afraid to ride him, and maybe she didn't want to sell him to me because I told her I wanted a horse I could safely ride alone.
Long story short, I found out later that she gave him to a horse trader (the same person I bought my new horse from). I also found out that sometime when she still owned him, he threw someone who was riding him and broke his wrist.
So in this one case, the sterotype did prove true. All the ground work in the world, and she was still afraid of him and gave him away to a horse trader.