To be lacking in a sense of humor is a true misfortune.  I would not go so far as to call it an offense against others; but it certainly is a detriment to oneself.  Social media seems to magnify our sense of self-importance; and when self-importance escalates, so does our sense of grim momentousness.  There is nothing wrong with being serious, of course, up to a certain point.  But there must be some kind of pressure-value to release the steam-engine’s expanding vapors.  And if the first duty of the philosopher is to be clear, then certainly his second obligation is not to take himself too seriously.  The truly wise know when to laugh.