Easy chaffing of radar missiles

Why is it for so many enemies of mine so easy to flare/chaff my radar missiles off from head on?

When I try to chaff and evade them I am already a dead man. But so many enemy planes just chaff then as if it is nothing.

Are this cheater as well, some some more subtle ones?

Or can anyone give me advise/tips/information why that is all the time?
It’s frustrating as hell.