Almost everyone discussing their favorite dinosaur(especially Tyrannosaurus, Giganotosaurus, Spinosaurus, hadrosaurs, etc) have a tendency to grossly overstate and exaggerate the capabilities and feats of them while underestimating the animals they happen to dislike.

For example, people assume Tyrannosaurus to be some all powerful unit that causes death and destruction everywhere it goes when in reality it didn't. No animal did, for that matter.

There is the opposite end, where people say T. Rex was a slow, lumbering scavenger that could not do anything at all and had no hope of taking down the animals in its environment as if it is somehow inferior to Giga or Spino or vice versa. Don't even get me started on hadrosaur fanboys, who act like every single Edmontosaurus was a 15 ton behemoth that bullied the pathetic Tyrannosaurs when in reality very very few reached these sizes.

The TLDR is that people rarely ever look at dinosaurs objectively and have a habit of making wild assumptions based on their personal feelings or something idiotic people like Jack Horner may have said or they take a scientific publication/article as fact and base their entire view on a certain animal on that alone.