What's your point? A rider's ability and/or ground handling could certainly be influenced by the person's fitness, experience (think "green, unbroke" person!) or "shoeing". For instance, I'd HATE to handle a horse in stiletto heels and am sure that my wobbling gait in said heels would influence my effectiveness on the ground OR in the saddle.

I have known horse to indicate some distress in the presence of a loud, rude person, but that speaks more to disposition rather than conformation. Certainly in the case of grossly overweight, unfit riders horses will indicate either downright rebellion or resignation. Most of the time, horses are extremely tolerant creatures. All the more reason to handle them with respect and make sure that the horse you're riding is appropriate for your purposes. No matter who you are.

We can opine by words. Horses can't.