Bacca was very good first season and carried Milan really well and all fans liked him. But Milan didnt qualify for Europe that season, and so Bacca ( after having a gentleman agreement with Milan before he signed that they would sell him if they dont make it to europe) asked to leave, and when Milan allowed him to, he only wanted top clubs playing in CL ( some rumours about him going to Arsenal) and wanted a pay increase. No one provided that at the time, some teams like West Ham wanted him and they were in Europe League. He took his time but then decided against joining, and it didnt work out with the other clubs that were interested in him. So he stayed and looked like he doesnt give a shit this past season although he scored some good goals, but had terrible attitude and played with no heart that Milan could have used any other mediocre striker instead and did as good. So yes Milan fans want him out now because he nags so much for something that is basically his fault since he refused to join the clubs that were interested in him, but in his first season in Milan fans really liked him, he was a top player.