On one hand I wanted to just reject him completely and tell him to just mind his own business. But if you want to call something a trump card then I happen to unfortunately have it in this situation. So I wanted him to know that he has no idea ultimately why someone would wear a mask. The reason that they're protecting themselves and others should be plenty. I wanted to tell him to come take it off my face if it bothers him that much but I calmly and bluntly told him I'm sick instead. I'd rather deal with his crap and tell him and the whole post office line my business if it means it changes his mind and he won't insult someone else again. He shouldn't be so bold.