

Then they should say they hate flatpak, or they are frustrated/disappointed when something they are interested in is only on flatpak.
Instead of doing that, they said they hate people who only use flatpak. Words matter, and that kind of entitlement needs to be shut down. The devs don’t owe them anything and they certainly don’t deserve hatred for their packaging solution. There are many constructive ways OP could resolve the issue. Open a feature request issue on the bug tracker, build it locally, send an email, offer to maintain another packaging method, etc.
You’re discussing servival and all your examples of why you can’t leave are that it seems inconvenient to adjust. Either you’re not actually worried about the outcome of staying or your priorities are backwards.