In that context he discusses the event of the knife incident.
You are correct in one sense. He said "How stupid are the people of Iowa? How stupid are the people of the country to believe this crap?" after he told the first part of the story, a knife breaking when Carson stabbed someone."
After questioning the truth of this and earlier events in Carson's life he goes back to the story:
So he's saying is that series of events. And he goes into the bathroom for a couple of hours and he comes out now he is religious. And the people of Iowa believe him. Give me a me a break, give me a break it doesn't happen that way. It doesn't happen that way. And some people might not like it 'oh that's not nice what you say' Don't be fools. Don't be fools, okay. "
So yes. He did say Iowans and the people of the country are not only stupid to believe this crap , he calls them fools.
He would have us believe Carson a liar because finding God does not happen that way. Trump did not use the word liar, but if it doesn't happen that way, what other conclusion is there? Carson lied.
I find that much more troublesome than calling someone stupid or a fool. Name calling his his thing, after all. Saying "It doesn't happen that way" tells me more about his moral compass than anything. This is what he thinks of someone's spiritual journey. If it is not done the way Trump thinks it is done, it is a false witness? Can you defend it or excuse it? Do you believe him when he tells Evangelicals he is on their side?
Nothing I posted was out of context. Not earlier, not now. These are his words and this is the context. Say what you will, but I did not take anything out of context and twist it around to make a point.
How stupid are the people of Iowa? How stupid are the people of the country to believe this crap?
In this instance the context was Dr Carson's religious conversion (From Briebart. )
In his biography, Carson has written about finding God after one of his violent outbursts, and doing so while sitting alone for hours in a bathroom. Trump wasn't buying it, and appeared to attack as "fools" and "stupid" voters who have, specifically Iowa voters:
Anyone in Iowa or the whole damned country is stupid to believe a man who told of the night he found God. This is how he wins. It turns my stomach because Trump has no boundaries.