I don't know how to interpret ばかにはええじゃねえか in the manga here. I believe ばかにはええじゃねえか = ばかにはいいじゃないか but I still can't make sense of this. As the picture suggests, the father says this as some sort of a greeting for the boy who's just got back from school. My best effort at translating this is something like "Aren't you look wonderful!" (my dictionary says ばかにいい = be mighty nice; be absolutely wonderful). But it's obvious that the boy is dejected, so my translation can't be right.