No you weren’t. That would be ridiculous. The deb dependencies are most of your Linux install. Maybe counting just the new dependencies being installed alongside a typical deb install, but that’s still not an apples to apples comparison to 100% of all the flatpak dependencies, even ones shared with other flatpaks, and even that’s still very rarely over 1GB.
Normal people who use Arch don’t bring it up much, because they’re all sick of the memes and are really, REALLY tired of immediately being called rude elitist neckbeard cultists every time they mention it.
The Ubuntu hate is because Canonical has a long history of making weird, controversial decisions that split the Linux community for no good reason.