Why did Pablo Picasso become dissatisfied with the Royal Academy of San Fernando in Madrid?

Pablo Picasso became dissatisfied with the Royal Academy of San Fernando in Madrid because he found the teaching there to be "stupid".1

Rather than focusing on the formal instruction provided by the institution, Picasso increasingly spent his time observing and recording life in the city’s streets, cafés, and brothels. He also dedicated significant time to studying the masters at the Prado, where he discovered the works of artists such as Velázquez, El Greco, and Goya. This experience ultimately contributed to his decision to break away from his formal art-school training and reject the academic path his family had planned for his future.1