ChibiR said:

Yeah, but the way I understood it, Scootabuse is the fandom's reaction to that statement. They went "Why would Rainbow be a terrible sister?" and came up with an explanation centered around abuse. So those pictures and stuff where Rainbow is a complete dickweed to Scootaloo are based on the assumption that they ARE sisters. So yeah, in context, this would be incest - the entire scene is just an AU.

Well that means nothing, fans named Derpy and shes getting renamed, fans think this little pony is her daughter for no reason other than similar hairstyle.

And fan's overreacted with the Scootabuse cause Lauren Faust never said she wouldnt make a good sister, she just stated Rainbow Dash isnt her sister, just an icon, a mentor.