It is not that it would bring "anger and pain," it is that it is a blatantly false statement. Big foot, aliens, things like that are debatable. Claiming the sky is red, or, like in our other comment, the earth is flat, are just blatantly flat incorrect statements. People would only make statements like this to cause a reaction out of someone. No one likes to be lied to and if someone is making claims like that they are either A) blatantly lying, which is infuriating because the person is trying to lie about an obvious fact likely just to be different and seem cool or B) mentally retarded. The latter of which would be an understandable reason.
It is not that it would bring "anger and pain," it is that it is a blatantly false statement. Big foot, aliens, things like that are debatable. Claiming the sky is red, or, like in our other comment, the earth is flat, are just blatantly flat incorrect statements. People would only make statements like this to cause a reaction out of someone. No one likes to be lied to and if someone is making claims like that they are either A) blatantly lying, which is infuriating because the person is trying to lie about an obvious fact likely just to be different and seem cool or B) mentally retarded. The latter of which would be an understandable reason.