Why are you on the reddit community, then?
likely new/all, i see a lot of formula 1 stuff i am not interested in and at least i huess here it is the same
Except that the user they were responding to is on lemmy.ml and the reddit community is on lemmy.world. Correct me if I'm wrong, but this post wouldn't show up on for them unless they'd joined the community directly.
lemmy.ml federates with lemmy.world seen here: https://lemmy.ml/instances
but some others like lemmygrad get blocked
Voyager is basically Apollo for Lemmy and it has filters.
You can block communities and users but not filter posts based on words like Apollo did (yet hopefully)
Is it possible to block entire servers?
No, not servers (yet).
Edit: I had a closer check and I don't think the Lemmy protocol itself currently allows you as a user to block an entire instance? Someone smarter than me please correct me if I'm wrong.