You don't hate Flatpak.
You hate the fact that developers don't need to track down 10 times more bugs, at the *minimum*.
You hate the fact that developers don't need to rely on other people to package and ship their software to end users.
You hate the fact that developers don't need to support at least four different environments, all with different libraries and versions.
You hate the fact that developers don't have to deal with the bullshit that's been plaguing the Linux desktop for the past 20 years.
You hate the fact that developers can feasibly ship their software to end users in such a way that it's sustainable for the long term.
You hate the fact that developers are less stressed and can put more time into making their software better.
If you reply to this with something like "but mah CLI app support", "but mah storage", "but mah 5 FPS", or "but some stuff breaks" then read my replies to similar comments here, or consider that everyone has room for improvement.