Make Light Of Meaning

(idiomatic) To regard without due seriousness; to joke or disregard inappropriately.

Example:   I wish you wouldn't make light of the matter, when it obviously means a great deal to him.
2011 September 2, Phil McNulty, “Bulgaria 0-3 England”[1], BBC:
  It was also a satisfying night for England coach Capello. Not only did he have a vital victory to celebrate, but his team selection was fully justified as Cahill gave an almost flawless performance in defence and Scott Parker's display made light of the surprising exclusion of Frank Lampard.