If I were in Russ's parents' position, here's what I would do:
- No internet. It doesn't matter if the Kiwi Orchards are saying mean things if he can't read them!
- All social media accounts set to private, the password scrambled into gibberish, and then logged out.
- No phones, except for an ancient flip phone that can only be used for calls. No dating/sex apps for Rusty.
- Drop all lawsuits against Null. Stop humiliating yourself in court.
- He should work a job, but it must be a job where his contact with women is kept to the barest minimum possible. If it's an online job, his internet usage is to be supervised 24/7. No seething at New Zealanders. No flirting on Instagram.
- No unsupervised trips. Don't want him running off to the brothels or wooing barbers, now do we?
Keep him like that for three or four months, and Kiwi Farms will move on, and he'll be forgotten. The most activity his thread will get is an occasional "to absent friends" post.
Unfortunately, his ego is so stubborn he'll need to be kept on this regime forever. The moment the leash is slackened, he'll go right back to his old ways.