I'm not a big clip watcher and I'd prefer to have some of those posts not appear in my activity feed. I tried to block some but due to them being given moderator status, I cannot.
Ah, I misunderstood. There is a setting that allows users to ignore administrator and moderator posts, but it is global. In other words, if on, everybody can ignore any/all admins or mods. That's not really workable. I looked to see if there was some usergroup finessing that would allow just one group of moderators to be ignored, but I do not see a way with the current software.
One possible workaround would be to Subscribe to every forum except the ones that have media in them and use the Subscriptions tab on your profile as a substitute Activity Feed.