Lemmy.world, by political ideology, is most similar to old Reddit. Namely, you're most likely going to find generally-left-of-center people. Several other instances (namely lemmy.ml) are known for being significantly more left-leaning, basically hard communist.
As is tradition for left-leaning people, there's a lot of infighting. .world people think that .ml people are tankies. .ml people think that .world people are corporate bootlickers. Both sides accuse the other of heavy-handed censorship.
Basically, I wouldn't worry about it. It's just your standard leftism infighting.