To add to that, calling them sexist further entrenches them. A big part of that movement is a reaction to being called sexist, racist, etc… All you’re doing is playing into their own propaganda. That’s why the “weird” moniker was so much more effective.
It is an appstore for Flatpaks. Flatpaks are a universal app package for Linux that runs in a sort of containerized environment. They’re very prolific in the immutable linux world.