If you’ve never owned a horse it’s easy to write off this recent AITA post as indisputable fat-shaming, however, keep in mind that horses, like all animals, have limitations, especially for older horses.
Redditor u/krr0421 recently asked ‘AITA’ after a friend who was too heavy for her horse tried to ride and OP denied her. That led to a fight during which the friend said OP was fat-shaming her.