I don't get it, Why does everpony say there shoulden't be glue in Equestria?

Because glue is made from horses, duh.

Glue is made from 馬 and Equestria's inhabitants are 馬 (ponies). Thats like looking in the freezer section in Walmart and, 次 to the chicken and pork, seeing a container saying "Real Human Meat". :P

Glue WAS made out of horses, rabbits, または fish. Nowadays it's all artificially made ingredients.

glue used to be made from dead ponys and 馬 it might still be for some places but idk but for some people i guess its disturbing that ponys use other ponys only DEAD when they use glue

Cuz glue comes from horses. sometimes when theyre dead. but if thats the case, i do not want to visit the glue factory in equestria

Because glue used to be made of horses.

That is because glue used to be made out of 馬 and other 動物 but there still is some brands that use dead 動物 but if youre not sure witch kind of glue to use now just use Elmer's glue it doesn't have any dead animals.

dont make any sence