This is getting a lot of play. A number of people are now saying they heard about it at the time. No one in a position to know has denied it.
One senior official summed up the meeting: “We needed to change how he thinks about this, to course correct... They were dismayed and in shock when not only did it not have the intended effect, but he dug in his heels and pushed it even further on the spectrum, further solidifying his views.”
Trump knows when he's being talked down to. But it's hard to avoid doing that when you need to discuss things with him with any depth. The result is that he pops a vein and digs in deeper. It's truly frightening to contemplate what he might do in a fit of pique.