Bruce's life in this AU is some fucked up shit. Like, some aliens showed up and were given his parents' throne (this is some fucked up colonialist/imperialist shit, the Els were given a kingdom because they are "racially superior") then his parents died so he was the orphaned rightful heir to the throne, but he was raised with royal family so he is loyal to them, while there has been fractions that wants him to get back the throne, but the Els will not do that. Then it turned out that he isn't really the heir to the throne, because his mother cheated on his father with Jor-El, and Bruce is a bastard born from this cheating, and not the son of the late Wayne king. And the man that raised him, the man he saw as his father, turned out to be an alien and died (Martian Manhunter is Alfred in this AU, and so Bruce's father. For the people that like the idea of J'onn being Bruce's dad, you know what you need to read). So, the palace, the house of his parents that was given to the Els, where he grew up as a guest, raised by the help instead of his actual father that never stepped-up to the task (Jor-El is dead now, and he never told Bruce he was his father), it doesn't seem like a home.
Talia brushing him off is certainly just so we can know her background. Ra's Al Ghul is a warlock of some kind and they are some "necromancy" (because necromancy is actually the reading of the future in the dead, not bringing them back to life) shit going on, which is cool af. This sound so much more interesting than the alien bs the other are dealing with.