omg, don't feel hurt by this, I bet your horse is cute. Personally I think every horse is cute as they are just one animal and how would your friend like it if you said to him that all him horses are ugly and can't run very fast. I am sure he wouldn't like it. Just keep your chin up and put this behind and im sure she was just jealous about your horse been the cutest one in the universe.
Once a ride, forever a friend!!