At least some of the dinosaurs. We only have strong evidence in the coelurosaur theropods, and a handful of ornithiscians (Psittacosaurs & Kulindadromeus). There's some minor evidence for other theropods having feathers. Like if Sciurumimus isn't a coelurosaur, because it's placement phylogenetically isn't resolved, and it had feathers.

So yeah most dinosaur kids will believe some had feathers. Media will still show a lot of dinosaurs without them though, so it's hard to say that kids overall will see it that way.