That would drive me bananas. My neighbour beneath me has a habit of slamming doors when she has a fight with her partner, I wish she wouldn’t. (yes I have asked her not to, but she is hotheaded and “forgets”)
However – in terms of your neighbour who has taken to opening and slamming his door every time the other neighbours slam the front door – is just being stupid, he’s not helping solve the problem. Can’t you speak to him and tell him to stop?
Has anyone spoken to the jerks slamming the front door?