Kind of hard to get outraged about it just a year or so after we got caught absolutely red-handed spying on all our own allies, including the German Chancellor's cell phone.
It bothers me, because as you've said, and I've agreed, nations don't have friends, only allies in a given situation or another, and allies don't always act in our own best interests, only theirs.
But on the other hand, Israel is looking after its own best interests, and so one can hardly blame them. It's a totally natural reaction, and an understandable one.