It is pretty easy to simply not engage those who you think may be "derailing" the thread. Another option is ignore. I was a big proponent of having the COVID thread- I pushed for it and Mappy agreed to start it. I only engaged occasionally, but that's because I was able to keep informed to the level I required without discussing it all day long, and frankly I have other things to occupy my time. I understand that to some it is an interesting topic worthy of investing significant time to discussion, however. Having a dedicated thread also kept it from dominating banter.