In the scene where Astrid confronts Drago, when he orders his men to get rid of Eret… several of the men who go to attack are wearing clothes similar to the members of Eret’s crew. 

Members of his tribe. 

While, obviously, they’re not going to disobey Drago… it does make me wonder how many enemies Eret has made among both his tribe, and other members of the armada. With that ego, I kind of doubt he’s popular.