Argh. How often has this argument been used to marginalize minority groups?
You can’t be bisexual, bisexuals don’t exist.
You’re not an atheist, you really believe in a god deep down.
You’re not depressed, just a bit down. If you just think more positively, you’ll feel better in no time.
The truth of it is that there are a lot of people out there who are marginalized and suffering, and by calling them “invented” or not real (you know, liars) you are not helping. I don’t pretend to know what the solution is to the problems in the middle east, but trying to magic away all the Arabs who were displaced by the creation of Israel is not going to work.