She chose to share, and thereby impress. Pronouns, obviously.
Update, via the comments:
Given Ms Vilkomerson’s ostentatiously woke outpourings elsewhere, I think we can assume that, whether true or fabricated, said tweet was intended to both amuse and be met with approval. A bit of peer-group positioning, The key part being the modish dismissal of “white boys.” (Sort of, “See, I’ve taught my daughter to disdain whiteness and masculinity. How brave I am.”) That said tweet conveys other things, and unintended ironies, seems to have escaped Ms Vilkomerson.
As public boasts go, it’s quite a strange thing. I mean, you can imagine a proud parent announcing that their fourteen-year-old had passed a chemistry exam or reached piano grade three or something. But wanting to announce that your fourteen-year-old has internalised pretentious disdain for white people, and white men in particular, seems… obnoxiously unhinged. That this is apparently something statusful, a basis for applause, or at least in-group belonging, does not make it seem less so.