Eu não lembro o que aconteceu no filme, mas no livro Dumbledore estava calmo.
“Did you put your name into the Goblet of Fire, Harry?” he asked calmly.
“No,” said Harry. He was very aware of everybody watching him closely. Snape made a soft noise of impatient disbelief in the shadows.
“Did you ask an older student to put it into the Goblet of Fire for you?” said Professor Dumbledore, ignoring Snape.
“No,” said Harry vehemently.
Harry Potter and the Goblet of Fire, Chapter 17, The Four Champions
Eu acho que Hermione explica muito bem a reação de Ron, quando ela diz
“Oh Harry, isn’t it obvious?” Hermione said despairingly. “He’s jealous!”
“Jealous?” Harry said incredulously. “Jealous of what? He wants to make a prat of himself in front of the whole school, does he?”
“Look,” said Hermione patiently, “it’s always you who gets all the attention, you know it is. I know it’s not your fault,” she added quickly, seeing Harry open his mouth furiously. “I know you don’t ask for it... but - well - you know, Ron’s got all those brothers to compete against at home, and you’re his best friend, and you’re really famous - he’s always shunted to one side whenever people see you, and he puts up with it, and he never mentions it, but I suppose this is just one time too many...
Harry Potter and the Goblet of Fire, Chapter 18, The Weighing of the Wands
Existem outras razões, porque esta foi a primeira vez que Ron não esteve envolvido na aventura de Harry.
1. Harry Potter e a Pedra Filosofal: Ron ganhou 50 pontos pela Grifinória
“First — to Mr. Ronald Weasley...”
Ron went purple in the face; he looked like a radish with a bad sunburn.
“... for the best-played game of chess Hogwarts has seen in many years, I award Gryffindor house fifty points.”
Harry Potter and the Sorcerer's Stone, Chapter 17, The Man With Two Faces
2. Harry Potter e a Câmara Secreta: Ron ganhou prêmios especiais e 200 pontos para a Grifinória
“You will both receive Special Awards for Services to the School and — let me see — yes, I think two hundred points apiece for Gryffindor.”
Harry Potter and the Chamber of Secrets, Chapter 18, Dobby’s Reward
3. Harry Potter e o Prisioneiro de Azkaban: Conseguiu vencer o Ministério da Magia e salvou Sirius Black
Agora olhe para isso do ponto de vista de Ron, seu melhor amigo encontrou uma maneira de se tornar o segundo campeão de Hogwarts, mas Harry não o ajudou a se tornar um campeão, nem Harry se incomodou em informá-lo. Como um amigo que estava ao lado de Harry para lutar contra Voldemort, Lupin (quando ele era lobisomem) e os Dementadores, Ron naturalmente se sentia decepcionado por Harry.