Poor judgment and a pointless thing to say. This sort of talk has been going on since Trump entered the race, but that was from the Trump haters. Cruz didn't help himself by joining the chorus of those who've spent three months insulting Trump and his supporters.
Signs of desperation from Cruz, who is staying in low single digits lately in polls. It is the old rule in politics...no matter how good you are, if you do not resonate with voters, you have no chance.