I understand that it's frustrating, but I'd like to suggest that we be the bigger people about it.
For every user in the vocal minority saying those things, there are plenty of users who will see kbin and lemmy mentioned more and more, and get curious.
If we start getting a "leavers vs stayers" mentality over here, we might drive away those people who could grow our communities.
Be relentlessly positive about our new home, and we will thrive in the end.