Having worked in that industry the sound guy should have fixed the problem instantly, or made sure it didn't happen in the first place. It was a massive blunder by the sound crew, sort of like a restaurant serving a salad with a dead mouse in it. Trump did what any good manager does - raise hell when somebody performs terribly.
In the sound business you know you don't get to make mistakes like that.
A good manager doesn’t do it in public. A good manager and leader would have asked for a different mic or found an alternative.
A bully castigates the in front of everyone.
Was on tour many years with major Rock and Country acts in major venues and you are right as rain in your comment.
If you're a true professional that $hit just doesn't happen.