Just WOW, if you were talking about humans you would be slated as a racist, you know all those negative things associated with a race color or creed, shame on you.
With horses as with people, just take them as they come, LOL the most laid back, quietest horse on my farm, is my Arab mare, I'll lead her anywhere with a bit of baler twine around her neck. Her daughter, also full arab, not so much, same breed, same bloodline, totally different horses and characters.
They are all individuals, get to know each horse, and stop being breedist!
“Never attribute to malice that which can be attributed to stupidity”