Ignore the chat, stick to the plan and remind them to mind their own business. You’ve been accepted there as a member, told what to do and that’s it, not their business then at all.
Then switch the alliance as soon as possible.
It’s only a game, it should provide fun and it’s not worth - they’re not worth - getting serious problems.
Sometimes there are true as***, sometimes there’s only no “synergy” or link between people and it doesn’t work and in both cases it’s time to move on.