make nonsense of

make (a) nonsense of (something)

To lessen something serious or important to a silly or ridiculous level. The candidate has been making a nonsense of the whole political process, but 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.
See also: make, nonsense, of

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.
See also: make, nonsense, of

make nonsense (or a nonsense) of

reduce the value of something to a ridiculous degree.
See also: make, nonsense, of