make nonsense of
make (a) nonsense of (something)
To treat something serious or important in a silly or ridiculous manner; to make a mockery of something. The candidate has been making a nonsense of the whole political process, but for some reason many voters feel that that is just what's needed. I don't appreciate you making nonsense of this class with your rude remarks and obnoxious behavior.
make nonsense of something
to make something appear to be silly or nonsensical. You are just making nonsense of everything I have tried to do. Your statement makes nonsense of everything you have said before.