Atletico Madrid attacker Antoine Griezmann was constantly jeered during defeat at Barcelona.
The Frenchman was visiting Barca for the first time since his refusal to join them last summer, opting instead to renew with Atletico.
His decision annoyed the club and, as is clear, its fans. When his name was read out before kick-off it was whistled noticeably louder than anyone else's.
During the game that trend continued as he was whistled when he had the ball, even after it took five minutes for the ball to find him, and those continued throughout the game.