I agree with painthorsemare, It is not the horse(s) the problem, it is with how you treat them. Do they each have their turn, or is it when you say their name, or do they have to do a trick for you etc.. as long as you know what result you want, and how you want them to behave, then just train them.
Some people like them pushy, some people like them respectful..
If you have any doubt put some training into it..
It is also a great practice for feeding time, when i come into the pen, the horses have to stay after a certain line, that is clear in my head.. and only when i call them into their pen (their by 2) and tell them they can eat are they allowed to do so. If not their is training, and i have all the time in the world to train my horses ;)
Have fun with your horses, not with people's principles!