Rosell believes that regardless of Barca's fortunes on the pitch, they always show themselves in a positive light and says that they win with dignity.
"Barca celebrates its title wins modestly, without offending its opponents," said Rosell.
"And humility? Humility is not being cocky."
Rosell also singled out Lionel Messi for praise for the way that the Argentina forward celebrates his own personal accolades.
"When Messi was awarded the Golden Boot [on Tuesday], he said that it was thanks to teamwork. Without that, there are no individual victories."
"He ran the length of the wing against Rayo [Vallecano] to defend, even though his team was winning 5-0 and he'd scored two of those goals. He made an effort. Even if you've done all the hard work, you have to keep making an effort."
Barcelona play Celta Vigo at the Nou Camp on Saturday night.