One neighbor (an acquaintance) and another neighbor whom I really do not know asked me why I was wearing the concentrator. When I didn't answer (thinking they would think better of the question), I told them it was private information. Both were surprised, maybe even shocked. When the acquaintance expressed his surprise, I told him it was like HIPAA. Friends who know me well said I should just tell people, but I really don't want to. Before I was using oxygen, I made the mistake of telling my crummy sister who has made nasty jokes about my condition. Also before O2, I went on a foreign tour on my own. One of the other women also made fun of me, which angered me (although I did not react). What do you think?