The aileron chord is proportionaly larger on tips than root in most planes, that`s why raising the ailerons in most airplanes makes a washout (less AOA) on wingtips, helping to get the wing root stall first, so, the plane does not want to drop a tip when entering a stall, and when you exit the tips fly first then the root.
Some planes like the funtanas have diferential airfoils on tips to achieve the effect, also, snaps need more throw (a snap stall one wingtip)

Greetings

Daniel