I, too, am surprised that you condone yelling at people. I have lupus, NF-type 1, Arthritis, and degenerative disc disease. The type of assistive devise I use (or not) varies from day to day (and sometimes hour to hour.) I may go into a store just fine and have to leave half-way through my shopping because I "wore out." I own and sometimes use forearm crutches, WC, canes.....it just depends on my needs at the moment. When I am not using a device, I look like everyone else (except for a slight limp and listing to the right at times.) I don't need the unpleasantness of someone who has no idea of my conditions cussing at me or calling me names!