Could be politics. A lot of people are appearently upset about the owners political views, which I think is very silly myself.
Also it seems that Reddit users are brigading against the Lemmy network due to the opinions of the instance owner on lemmy.ml.
Its just so stupid, all of this. Why are people like this? Why do we demand everyone to think the same way and have similar opinions, or we feel like we need to go fight them? We dont have enough things to fight about in the real world?