I just tend to tell people what I have and it usually shuts them up.
Although it never fails to amaze me how many total strangers find it quite acceptable to point out that you have a red nose and being in Australia thinking I am yet another stupid 'pom' who doesn't know how to use sunscreen! I mean that is just not acceptable. Would they go up to a person who had an artificial limb and point it out to them and wonder how careless they are to lose it! No I doubt it very much! Sorry rant!
It is more hurtful when it is somebody you know such as a friend or family member who like to laugh and point out your red nose after a glass of wine and say you look all red and 'drunk'. My step-mother was a real great one for this

and would take great delight in pointing it out and laughing. She knew exactly what the problem was. Well at least I don't have to see her any more since my father died.