Why did bud say it's terrible to have been brought up proper?

In Mark Twain's "The Adventures of Huckleberry Finn," Huck Finn's friend, Tom Sawyer, suggests that it's terrible to have been brought up "proper" because it can stifle creativity and individuality. Bud, who values freedom and a more adventurous lifestyle, sees the constraints of societal expectations as limiting and oppressive. He believes that a proper upbringing prioritizes rules and decorum over genuine experiences and personal growth, making life less fulfilling. Ultimately, this sentiment reflects a critique of the constraints that societal norms impose on personal freedom and authenticity.