Something new to the community since I was a lad, is the influx of Amish. Of course, they do not use motorized vehicles to get around. It is not uncommon to see this site all around town.
Most people do not mind that they have to deal with horse drawn vehicles in traffic, at least not now that state law requires the Amish to display the orange "slow" vehicle sign. What they do mind is that they are not required to, nor do they voluntarily use, the poop baskets attached to their horses. It is not uncommon to see piles of horse manure in the Walmart or local grocery store parking lots.
I see a lot of horses exhibiting this behavior. It usually means that the horse has a sore mouth or that the bit doesn't fit correctly. That's all I'm gonna say.