some people really are completely brainless, aren't they? makes me absolutely despair.
fwiw i heard a story years ago about a bottle-fed colt who was taught to do that by his doting owners when he was a lovely cute skinny lightweight foal. awww, bless, etc etc. of course, it was slightly less endearing when he continued to try to do his best trick as a strapping yearling. eventually they had to shoot him...
That was my thoughts. We had a pony come stay as a companion, it was hand reared and used to rear at you boxing, because that is what it was taught to do as a foal. Not so good when it was 13.2hh 2yr old. To catch my pony in I had to call her over to the fence and jump on her to ride up the field to the gate. If I was on the ground this pony would come at me. It went back after a couple of weeks.
there would be alot less unmanageable horses and ponies about if people brought them up more responsibly and treated them as equines, not matter what their size
one of the worse equines i had to handle was a 10h pony who had been badly spoiled and treated like a dog then dumped.in the end we had to put a chiffney on him to get him to the pony sanctuary and have two people leading him as he reared and reared and reared