The striker was again barracked by the home support during victory over Deportivo La Coruna.
Karim Djaziri told Marca: "These are difficult times, but since he was young he showed that he is very strong mentally, as well as throughout his time in Madrid. He has been at his dream club for nine years.
"It's unfair that he was whistled when Real Madrid were winning and he was returning from a month-long injury. Karim has always shown exemplary commitment to the club and has put the team before himself, so he doesn't deserve this treatment."
He continued: "He doesn't understand it and it's a lack of respect for a player who is the club's seventh highest scorer of all-time.
"He has participated in some of the brightest eras the biggest club in the world has enjoyed. You can whistle anyone, but never a player who hasn't even been on the pitch, it's incomprehensible."