Can you explain the following passage from "Night" as sadly ironic?"the yellow star? Oh well, What of it? You don't die of it .." (Poor Father! Of...

Most likely, this particular line is a reference to the Holocaust. My guess is that the father and child are Jews. In this case, the father is trying to downplay the significance of the "yellow star": an identifying badge all Jews had to wear. This line, then, is ironic because almost all Jews who were unfortunate enough to be labeled with this star were eventually executed because of their faith. The star is a symbol--one that does indeed lead to the father's death.