The Mexico international spent the 2014/15 season on loan at the Bernabeu, where found the environment more challenging than Old Trafford.
"I think it's the culture," he said.
"It's just a description, it's not something that I want to make less or make more any of the clubs. It's just a description, you know how the way of life in England is a little bit more calm, a little bit more close, a little bit more in that way.
"In Spain and Portugal it is more the Latino way. It's the culture, it's more open, they're more exposed.
"In United I never felt in the outside that it was completely as massive as it really was. But you know not many fans outside, not many press, not leaking news, you can walk a lot in Manchester, they respect you more.
"In Spain they respect you but they are more like my country, they want things from you, they want the picture, they want to grab you."