I don't think Amber and Hillary were so much "defending Stevie's honor," as wondering why the two women need to be compared.
Yes, Erica mentioned wondering if perhaps her professor meant
"Stevie" when he said "Christine," but it really didn't have to lead into a comparison of the two.
From what I read in their posts, all Hillary and Amber were trying to say... which is something I'd think all Christine fans would be on board with... is that Christine does not need to be compared to Stevie in order to be praised or complimented. Nor does Stevie's appeal need to be dissmissed in order for Christine to look good.
Christine can, and should, stand on her own merits.
And if Homer's tired of hearing about Stevie so often on Christine's Forum, he shouldn't take so many opportunities to mention her.