Just because you can raise your hands over your head doesn't mean it isn't painful. In any case, it's legal to opt-out of the scanners, so why would they care

Just because you can raise your hands over your head doesn't mean it isn't painful. In any case, it's legal to opt-out of the scanners, so why would they care what method you use (really what language you use) to indicate you'd rather get a pat-down than go through the scanners? Either way you're complying with the law.