Typically, I will take a postcard and add some wiseacre or snarky comment or caption to make it more “honest”. This one, however, is plain and simple, a plea for the recipient to stop whining, because “dis ain’t no morgue”. I don’t know what you would send to cheer up someone who worked at the morgue.
It should be noted that this postcard was printed a scant few years before a global flu pandemic. At that point the thing to do about someone sniffling, would be to get as far away from them as possible.