I suspect if Trump had made a remark about Israel getting $3b a year, and a Jewish kid had said something about how Israel is the US's closest ally, having fought shoulder-to-shoulder with GI's in multiple wars, and Trump had asked whether the kid was Jewish, we'd be hearing about how Trump was anti-semitic.
If he said anything, it would be more like “Are you Israeli?” I don’t understand how in this mad, bad world it is suddenly (oh, that hated word!) “racist” to ask where someone is from!