If it really is delivered in a mean-spirited way into the face of another; but this is a fictional student who has behaved in an exasperating fashion. No need to be a Holy Christian martyr when writing ironically about it as a help to the many students who read his columns and consider signing up for his courses and who might be tempted to use lame excuses after slacking off all semester. No one is forcing students to study with Adams; they register for his courses. He is not teaching required basic courses for the entire student body -- he is teaching majors in criminal justice. Justice on earth involves consequences for one's choices, no matter how much Christian forgiveness may be sought or felt. A repentant murderer is forgiven by God, but must still go to prison on earth.
It’s okay to dip deep into sin if after all it is... hypothetical? With a bunch of excuses?
There are grace ways to handle such issues without excusing others’ sin too.