Every time she stopped and whinnied, she got smacked once on her haunches with the dressage whip that I carried. They were good firm smacks too. Tapping them lightly won't work.
I could try this, he's a little terrified of whips but I guess I could give it a go and hope he doesn't kill me.
The good thing is that this is fixable. The bad thing is that since you've already established that you'll back down if he insists, it's going to take twice as long.
I think the good thing is is that he's only done it once, I don't ride very often because he's had back issues and i've only ridden twice with other people so at least that's a plus.
What you need to do is get him thinking about you, which can take anywhere from 5-30 mins. Keep him thinking about "oh what are we going to do next mom". Once his ears prick forward or he's looking at something else, bend him in a circle. Keep doing this until he realizes "it's way easier to listen to my mom than to look at other horses".
I bet he deos get bored so if I keep him guessing he might be more focussed.
Try to use the 6stride rule. Aftere 6 strides you change what your doing either gait direction speed etc this will ensure he is listening as your constantly changing.
I'll give this a try too!
Heres the thing, its easy to be a good boy and listen to you when there is no one else around and no distractions. Personally I would work his butt off every time his attention wandered. Disengaging, circling, backing, flexing, patterns, anything you can to keep him moving and eventually he will realize its a lot easier and less work to listen than ignore you. You said he forced himself in behind the lead horses and ignored you, that is COMPLETELY unacceptable. Do you free lunge him or use a line? I would introduce him to every distraction imaginable. Lunge him in a field on a long line with someone riding in the same area, or right next to his field mates. Tie another horse up in the round pen(if its big enough) and every time his attention goes anywhere but you work his butt off. Ride him in a field with someone else so he is contained if he should blow up and you come off, and don't let him get away with a single iota of inattention. Every time you go near him think of the most dominant alpha mare you've ever seen and become her!
I both free lunge and lunge on a line with side reins. And both ways he's very focussed. I could ask for someone at the barn to ride when I lunge him to see what he's like.