I’ve seen a lot of LW users behaving like this.
They want a single comm per topic, preferably in LW; and everyone should go to that comm, no dissidence allowed. Always talking about “not splitting efforts”, or some FUD like “unless we gather together Lemmy will never succeed”.
And, when you tell them a clear “no”, they throw a tantrum. Like Serinus did there.
I think that they got out of Reddit, but they didn’t get Reddit out of themselves. They still behave like this was a Reddit-like monolithic platform; so when they see decentralisation - like multiple comms for the same topic, in different instances - they treat it as a bug, when it’s a feature.
Anyway, I’d call that FAPTB (failed attempt of powertripping). EDIT: wow, they removed your mention of the other comm! Talk about pettiness. PTB.
A group of room-mates once created a subreddit called r/195, after the number of their apartment. The sub became too popular for the room-mates to moderate, and they closed it down. Then someone created r/196 as its successor.