This is an important, if subtle, distinction — and one that conservatives should be familiar with. Douthat is suggesting that the crowd wasn’t booing Israel, instead, they were booing Cruz for playing politics — for having the audacity to lecture them about their own business.
Remember that Republican debate where the crowd booed a gay soldier? The optics were horrible, but here’s what I always suspected. I always suspected that they weren’t booing the soldier so much as they were booing the media for setting them up.
They were booing the media for the unseemly way they were using this soldier to advance the notion that conservatives are anti-gay. They were booing the media for focusing on this one wedge issue when there are so many important issues. They were booing the media for framing the debate when it should really be up to Republicans to select their nominee. They were booing because they were being used as a pawn — as a backdrop — to make a larger point (at their expense, no less).