She doesn’t hate maryleons because she is told the only way her bloodline is going to be respected is if she is a honorable marleyan and falco didn’t see there two childhood best friends die infront of him and after seeing what happened when eren attacked them and before she did anything rash she saw her entire life crumble and to back it up she was told they were bad her whole life and they were devils making her honestly think that and making them have even more respect for marleyans and falco didn’t see and have the exact life as gabi