Honestly, NEVER. It just doesn’t occur to me. That sounds like something a person who thinks constantly about their own sh*tty life would think, and that just ain’t me. Besides, if I give my brother a hard time for being bummed about breaking his leg just because he’ll eventually heal up, why shouldn’t the ventilator-dependent C1 quad I know get all bent out of shape at me because I complain about neck pain? “Geez, must be nice to be able to feel your neck.” Right?
I say, there’s always someone better off than you, and there’s always someone worse off. KWIM?