Background Pony #57F6
Mules are sterile, and canonically ugly. It would make sense for ponies to look down on mules to disuade other from making more mules.
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Comments
6 comments posted
adatron 
Rectify.
Bad enough that he’ll never have children of his own.
Background Pony #227E
…I made a mule oc because of that… >: not all ponies are “pretty” so not all mules should be deemed “ugly” it just grinds my gears…
Kamazeustra 
Goldenlöwe in Aeternum
Well, now I feel like a jackass.
ClownDicks
Ha ha! Casual speciesism!
♥♥Princess♥♥Celestia♥♥ 
The Bestia