From what I know, most raptors had feathers and that’s where birds came from.
The broader group of theropods, including the T-Rex, had a precursor to feathers literally called “Dinofuzz”.
All other kinds of dinosaurs I believe are actually scaly like we thought.
As someone who grew up with a friend that constantly made edgy Nazi “jokes” and was also a Brony, this is chillingly accurate.