I've owned two palomino mares and both of them got bullied by the other horses in the field. This happened about 10 years apart and at two different yards.
My first mare, Goldie, was chased out of the field over a 5 bar gate and generally just chased about on a regular basis.
My second mare, Molly, was also chased around and we arrived at the stables one day to find her on the floor and a 12.2 pony standing on top of her.
I don't know whether it was their colouring or whether because they were mild mannered ladies but either way, the other horses really didn't like them.
Has anyone else ever experienced anything like this?