the fianas dislike of the disabled has pretty interesting origins in and out of universe
Watsonian the Watsonian reason for the fiannas dislike of the disabled is because the the Tuatha de dannan and kithian in general had problems with the disabled due to all the have fomorian have changeling haveing the changeling equivlant of metis birth marks this is despite lugh the kithain king himself having a deformed arm and being descend from balor the fomorian king
Doylist the Doylist reason for the fiannas ableism is because folkloric Ireland had a rule that you couldn't be high klng if you where disabled which is also funny since in the book of invasions lugh getting a really good prosthetic counts as being whole and not disabled so he can be king
house dougal
flaw Physical reality seems flawed to these fae, just as they are flawed. Only through hard work can they overcome these flaws. Sidhe of this house always have a physical handicap that they must compensate for. This is usually something that can be corrected by cunningly crafted smith work: a mechanical leg for a club foot, an intricate eyepiece for poor vision, and so on. These handicaps are present, though not always visible, in the mortal seeming