which linux distro do you NOT like, and why?

If I run apt install firefox, I expect a deb, not a snap

I much prefer the AUR and native system packages to flatpak. It's the big advantage Arch has over other distros, just how much software is natively available due to the AUR. There are a few cases where flatpak works better but generally I prefer all my apps to share one set of up to date dependencies.