They booed because they understood that they were being mocked.
Baloney. The only thing they understand is "Hillary for Prison" and "Lock Her Up" - they say it on cue now like good little lemmings. This is a cult following - Trump could show up naked to his acceptance speech, squat and take a dump on stage, and the lemmings would go wild. The lemmings are out of shits to give because they been fed a steady, calculated diet of lies and CTs, and gleefully eaten every spoonful. Jim Jones would be jealous.
Well, I lost my 100 Quatloo bet on Cruz endorsing Trump. In a not unexpected move of assholery, Trump walked in on Teds speech, stole the finish with his entrance, and Ted was booed off the stage. Unity!
What a farce.