A little flash of light may not, but as the pilot advised, it lit up his cockpit and made him loose full control of his aircraft, so that's hardly a 'little flash of light' is it?
It is different to sun glare - the sun has proscribed the same flight path since before the earth existed, it's not too hard to make allowances for it, given that you always know where it will be at any given time.
If the sun's light was in the hands of a dimwit moron shining it willy nilly into aircraft cockpits, then yes, that would be different.