I think there's a distinct difference between the two, and it especially depends on someone's personal level of insecurity and how much they support you. But if you showed your friend a photo, for example, of yourself, and she said, Oh my gosh, you look beautiful! You're glowing! You look amazing! Normal compliment, versus if she looks at it and says, Oh my gosh, you look so beautiful! You clean up nice! Or you look so beautiful, I didn't even recognize you for a second! That would be incredibly backhanded. And I think that's the difference.