My friend treats her 3 year old son like a girl?

Since he was a year and a half my friend started painting her son's nails, putting makeup on him and dressing him up in little girl's clothes. She takes pictures of him all dressed up and posts them on Facebook. She has admitted before that she is a feminist and wants to raise a "special" child and that children with gender disorders intrigue her. I can't help but think the worst - that she is screwing with his mentality for her own personal wants and beliefs. I spend a lot of time with them and I baby sit him from time to time and when she's not around he wants to go play outside in the dirt or will see toys for little boys at the store and asks me to buy them for him but when his mother is around all he wants is girl themed toys, jewelry, makeup, etc. I just don't understand. I am not opposed to children who have gender issues, as I do believe the brain is a powerful tool and some people may not feel comfortable in their skin as a female/male. I just feel like my friend is pushing her son into her beliefs and I don't think that this is healthy for him in the long run. I am going to talk to her about this - not to be rude but to better understand my friend on another level. I just need some words of advice so I don't feel so nervous about asking her why. How would you go about this situation?