The point is, aside from just being unpleasant to be around, you are teaching your child that they do not have to be respectful. You are teaching them that the world is there to cater to them, that everyone else’s experience means nothing, and that whatever rules may exist do not apply to them.
Imagine M.I.A. idly making insanely loud whale noises while jogging through a crowded park on a beautifully sunny day in April or October. Imagine Gucci Mane making attention-seekingly loud whale noises as he brusquely “storms” out of an Office Depot after a 15-minute argument with an employee about the extra costs of reformatting his external hard drive.