Mrs F has horses. The cost of them scares me - buying them, feeding them, shoeing them, vets, stables, fields, tack ...
They can be out of control, but then quite a few bikers can be too - are we all in 100% control all the time? Never fall off? A bit of consideration and the world can be a nice place
I guess as we ride on bridleways we ought to be glad that horses get ridden. No horses = no birdleways.
Being practical, human + bike = 60 - 100 kg (say, ignoring Ton).
Horse = 350 -700 kg roughly, has 4 rock hard feet with knuckle dusters attached, and a propensity either to (a) kick first and ask questions later or (b) accelerate way faster than you as it tramples over you as it flees a plastic bag.
Options - argue about how wrong it is to bring a half-controlled lunatic onto bridleways, or make way.