I know things will be all right. Look for the bright side. Why then would I begin a discussion with a paragraph like the one above. The answer is simple. There is a limit to mindless advise which can, sometimes, get exceeded.
Physical disabilities are just that - disabilities.
They are limits set down by a force over which we do not necessarily have control. Quite often they take away parts of our lives that we were very fond of. There are plenty of good reasons to be angry. It is equally understandable that some able-bodied, well intentioned person would utter statements like those above. Unfortunately, there are times when the effect is anything but positive and there is an urge to them with a sarcastic rebuttal.