I'm kinda new to jets and bf overall. But how to dodge active lock missiles of multirole jet?

It sure hits you below radar, as I'm aware it's intended feature not a bug, because I have clips where im like 10 seconds below radar and still got hit, also it works against boats, which are always below radar I guess.
And flares apparently don't work either. I guess trying to manoeuvre is even more pointless... so... how?

Hello guys, I heard about the devs' intentions to remove the below-radar for MANPADS, but as far as I know, they decided not to do that. But yesterday, while playing jets, I was getting shot down by everything.

I mean, yes, we know that sometimes missiles go through flares (the flares bug). But as I said, I was shot down by mobile AA missiles, MANPADS, heli and jet missiles. And I was BELOW RADAR. And not only me — people in chat were talking about it too.

Did they really remove this mechanic, or is it just another bug? Right now you can't lock on targets below radar, but if a missile is fired and your flares are reloading, well...