In short: it really was every bit as terrible as your thought:
On ABC this morning, Trump responded to Khan’s speech. I don’t know what I expected from Trump. Maybe he would show some gentleness. Maybe he would show some empathy. Maybe he would refuse to comment. Maybe he would attack Hillary Clinton and Barack Obama’s foreign policy leadership. All of those responses would have been fine.
Trump’s actual response, though, wasn’t fine.
"If you look at his wife, she was standing there," he said, on national television. "She had nothing to say. She probably, maybe she wasn't allowed to have anything to say. You tell me."
This wasn’t a slip of the tongue. In an interview with Maureen Dowd, Trump took the same tack. "I’d like to hear his wife say something," he said.
Let’s be very clear about what Trump is doing here: as ABC wrote, he’s suggesting "Khan’s wife didn’t speak because she was forbidden to as a Muslim. This is bullshit. It is flatly, verifiably, false. But that’s almost beside the point.
Trump listened to a speech by the bereaved father of a fallen Muslim soldier and used it to slander the fallen soldier’s family. That was his response. That is his character.
We didn't even get to the part where Trump said:
“I think I've made a lot of sacrifices. I work very, very hard. I've created thousands and thousands of jobs, tens of thousands of jobs, built great structures. I've had tremendous success. I think I've done a lot.”
You can read the rest at Vox, because like Secretary Clinton said there is no new Donald Trump coming.
You can look at the interview in question for yourself at ABC News.