I'm not playing the sympathy card by the way.
I very rarely drive, and have hardly ever parked in a designated disabled parking space, but when I have occasionally used my blue badge, I've been verbally abused by idiots who presume I'm not eligible because I 'look' healthy.
As stated, when at times I'm unable to put one foot in front of the other, get dressed etc, I tend not to be in the public gaze.
Don't worry though, anyone foolish enough to question if I really am ill, doesn't walk away unscathed, especially if it's a two-pronged attack, if my mother happens to be with me.
