I'm not sure about the level of detail I need to provide for this so please bear with me...
My niece has just turned 13. I'm 38, childfree and she's my 'little brother's' (foot taller, 36yo) daughter. He has two other DC's (DS11 and DD8) and he and his ex partner have been separated for around 6 years.
My DB and his XP relationship is not fantastic. He has the DC every weekend and often during the week and from what I can gather this (wonderful for him and the DC) level of contact is because she can't be arsed. She won't speak to me or our DM and has previously had an OCD-related MH diagnosis.
Anyway. I visited the family this weekend, DM kindly picked me up from a late-ish boozy dinner with friends with DN in the car also. We passed pubs in town and DN said "Look Tzella! Slags!" while pointing out of the window at some young women on the street. I'm ashamed to say I shouted at her
Along the lines of "You can't say that about people! They are young women on a night out! You are a young woman! You can't say that about other women!" I barely made any sense but was shocked and upset. I caused an atmosphere and my DM was lovely and changed the subject and we chatted about other things 
I obvs feel like a shitbag
but it's got me thinking about my DN's feminist education, for want of a better phrase. I am not sure she's going to get much grounding from her DM and, me being Cool Aunt (hardly) I feel I should... should do something. She's too young for Caitlin Moran (?). What else is there? I can't remember exactly what my DM said/did for me when I was her age but I do recall making a fuss about 'being allowed' to be on the cricket team at school. And that was in 1985 as I am ooooold and I know the world has changed a lot.
I hope someone understands what I mean? I'm not sure I do exactly!
Help!