You could try NOT using them and NOT being grateful something pretty neat was even introduced.
Are they perfect for all lighting and all types of users backgrounds? No, this is a -3k computer not Lucas Industrial Light and Magic. Apple at least gave something kewl and if you have a decent lighting and stable background they work pretty good for what they offered.
Far be it for Apple to do anything new and inovative, but I fail to see where MS's backdrops are in their camera application............................................................. OHHHH Wait, THEY DONT HAVE ONE.
Rather than be so damn negative how bout just being grateful they added something like it. So it doesn't work with where your Mac is, it works great with mine, it's not perfect but it still works pretty kewl.
Better yet, lets have Apple remove ALL photo booth effects? Would THAT make you happy? Cuz you can always "Move to Trash" the files then you won't be tempted to use em.