Having done a lot of affil in the Falklands, helos are a difficult target. The slow speed makes it difficult for a PD equipped fighter to lock to the target. A stationary helo is the same as a car so radar designers spend much effort designing that particular problem out of a radar. Slow speed targets are tricky for any weapon which uses speed as a discriminator.
The easiest way to engage may in fact be a strafe pass.
Suffice to sat that helo pilots need to know how to evade a fighter. Fighter pilots need to know how best to engage a helo. With modern ops, that's good training.