Glitter is the most iconic flop. Some of you are too young to remember that era, and the "meltdown" that went with it. However, it is still remembered by most people.
If you ask a 37 year old man about Bionic, he'd likely know nothing of its existence. Same with ARTPOP.
Glitter, on the other hand, was a flop that the general public was(and still is) very aware of.