I want to see the quote where he insulted them BEFORE they heckled him
He didn’t
Cruz said: "I’m saddened to see that some here, not everyone, are so consumed with hate,” at the beginning of the video
Not a good way to begin your speech by accusing some in the audience of being consumed with hate.
He didn’t
It wasn't like they all acted as one person. Cruz got applause at the beginning of the speech. Then he got a few boos along with the applause. Then he got confrontational because of the mixed response. Then when it was clear that he was going to walk out and that he'd written the night off, boos and heckling predominated.