Although you're free to like/dislike whatever you want, calling other people's food vile seems kind of mean. There are plenty of old/ancient foods that look exactly the same as jell-o
warabi-mochi, nata-de-coco, aiyu jelly, kokum, annindofu, kanten, blancmange, to name just a few
Jell-o is a byproduct of the meat industry, none of what you listed seems as bad nor look as bad as a mass produced artificially colored and artificially flavored blob of pork gelatin seating in a plastic cup.
If anything I'd say my take is less insulting to these other dishes than you are by comparing them to jell-o
warabi-mochi, nata-de-coco, aiyu jelly, kokum, annindofu, kanten, blancmange, to name just a few