I'm sure some people will appreciate not having to see threads derailed by the trolls. I'm sorry for any additional administrative overhead it'll add to your plate for watching for it (or if reported to you, verifying) and then executing it.
From my lurking, I can only think about three pairs of people that tend to do this pretty commonly, hopefully that'll really take care of the majority of the issue.
Hudini - easiest way to do that is just see who started a thread when looking through a parent forum area. If you see it was started by someone you know irks you... skip the thread. There are folks that I tend to skip threads, or their posts, for that reason. The contributions are either non-constructive, or fully destructive; no sense in letting it irk me or trying to say anything corrective because that is usually just giving them a signal that they've got someone's attention and can keep going.
[This message has been edited by Trinten (edited 11-11-2021).]