This horse sounds spoiled and lazy. I wouldn't trust him. I know somebody that has a horse like this. My mare hates him. Only owned her 3 years but it's the ONLY horse she has come across that she vehemently reponds to. (She can be ridden by anybody, BTW--didn't break her, just bought her that way.)
The horse she hates is pushing 12 yo and the owner gets a "no" on lots of little things, and the owner gives in. His horse is a powder keg. I don't wanna be there when he explodes. He's an 18hh Fresian/TB cross.
MY original Hunter instructor would pull a student and get on to fix a problem if he saw the horse wasn't responding. We didn't have anybody hurt (that I know of.) We did have a "hunter graduation" where our teacher was the "Fox", some of us (me included), were the hounds, and everybody chased him around the Forest Preserve on an Autumn Saturday--1970's, you see. He had ribbons pinned on his back. If you found him and grabbed one, you got a gift from the tack shop. I STILL have my TB racing pin. **sigh**