Not all geldings go nuts over mares. My silly gelding has been turned out to pasture with broodmares in heat and got confused when they flirted with him. He still does even though he's only out with geldings (current place separates by gender).
Honestly, if a gelding goes mad over a mare that isn't your fault nor your responsibility. The owner of said gelding shouldn't bring their horse into a mixed group if they aren't going to train their horse. Posted via Mobile Device