I am kinda with Cassiemom on this being old or disabled doesn't mean it is ok to be darn right rude, but i do know that as you get older your tolerance levels drop, have noticed it even at my ripe ole age lol,so i guess just gritting your teeth and being nice is a good thing to do,but sometimes there are just grumpy,ungrateful people in this world,giving her the benefit of the doubt is a wise call and being nice won't hurt will it?