nothing should be negotiable. If you 'negotiate' things with your horse, you're not in full command. The lead horse never asks politely "would you stop eating your food and kindly let me have some?" they demand it. If they want the food they make the other horse move. Even if the horse doesnt want to. And they usually don't want to. Tying is something that every horse should learn how to do. If a horse doesnt tie nicely, then you train them to, just as you would with anything else they have issues with. Don't think of them like people, you have to think of them like horses. Horses don't ever see another as an equal, only dominant or submisant and if you let the horse get away with what he wants, then he is in charge of you and will take advantage of you in other situations.