Recently my 6 year old DD has been spending more time playing with the boys in her class. This has now turned into her saying she wants to be a boy. I think it's about wanting to feel more part of the group, rather than anything to do with gender identity, but I tried explaining that and I don't think she's old enough to grasp the difference. She said that she feels like she likes "boy things" more than she likes "girl things" and I've explained that there aren't girl and boy things - anyone can like anything and being a girl doesn't stop her playing with boys or doing "boy things" (but if we were going to bring gender stereotypes into this, her interests are unicorns, Frozen, dresses, etc!) I think she does at least get that sex is immutable from past conversations we've had.
Not sure whether there's anything else I should be saying or doing or just take it with a pinch of salt and assume it will soon pass. I guess my worry is the risk of this proliferating in a way it wouldn't have done years ago due to modern-day wokeness; when I don't think she actually does want to be a boy!