And, you base this on personal experience, or just from what you've read?
I've flown into Israel a number of times. Several times as an active-duty member of the US Navy. They "interrogate" everyone. Some people, they just interrogate more.
You're a foreigner traveling on a non-Israeli passport - you believe you shouldn't get a flag? How are Israeli's treated in their own country? How are Americans treated in their country? Is there any difference?