I can understand you needing to let off steam AvenaLife - it's more the thread's holier than thou tone I've had a problem with.
I can understand feeling sad about seeing it happen, and hoping it was an isolated incident, but the flaming torches and pikes on this thread have made me very sad, and even sadder if the mother in question is reading this.
And people are far too ready to scream the word abuse these days, it has some very serious connotations, and imvho, I don't think one incident of calling your child stupid is up there with hitting them, or mistreating them sexually, or starving them.
if a mother called their child stupid once, but all of the rest of their life treated them with kindness and respect and love and never did it again, I doubt anyone would say they'd been emotionally abused.
but if she called them stupid every day, and took every opportunity of belittling them, and never praised anything they did - now in my book, that's emotional abuse.
big difference, and all to do with context.