My opinion, which I tend to voice when I hear "fake" in this context, is that unless the person accusing is a licensed psychiatrist and has the authority to diagnose the person in question (usually me), and has conducted lengthy study into (my) particular issues, then they are not qualified to make such diagnosis and are therefore most likely liable for malpractice. Well, probably not, but they generally don't know that and it shuts them up.

I've had extensive issues with my extended family claiming I'm "just trying to get attention" or "faking to get out of ..." and such. It took a long time to realize that there is no way I will ever convince them, stacks of proof in hand, of the truth. More to the point, I don't have the strength and energy, and now, the desire, to waste my time with such people. I know the truth, my doctors know the truth, and my very supportive husband and teenager know the truth.

I learned, after much head-against-wall-banging, that I can't change the opinion of ignorant people. If they don't have the presence of mind to understand and accept, then they have their own issues to deal with.

That being said, I do believe there are "fakers" out there. As another said here, it's most likely they have a mental illness that causes such behavior, just not whatever they are claiming. That's not for me to judge. That's for them to work out on their own.

Just my 2 cents.