Ponies, Horses, ponios, horsies, baby's ... terms of endearment in my opinion and totally harmless.
I call Archie my baby boy, I mother and fuss him and sums up how I feel for him. If anyone is offended by that or thinks I am pathetic so beit but please don't criticise me or others who feel the same.
I have a (14.2/14.3/15hh .. really must measure him again lol) .. He is "my Boy" or my "pony/ponio" .... Its just an endearment term ... though behaviour dependant, he`s some times called lil **** lolol !!