Some research has suggested that millennials are more likely than older generations to embrace gender fluidity and non-binary identities. For example, a 2017 survey by the Pew Research Center found that 35% of millennials believe that gender is a spectrum, compared to 25% of Generation Xers and 14% of Baby Boomers.
Another study, published in the journal "Sex Roles" in 2018, found that millennials are more likely than older generations to reject traditional gender stereotypes and to support gender equality. However, the study also found that millennials are still more likely than older generations to hold some traditional views on gender, such as the belief that women should be responsible for childcare.
Overall, it seems that millennials' attitudes and behaviors towards gender are complex and evolving. While some millennials may identify as gender rebels, others may hold more traditional views. It is important to avoid generalizations and to recognize the diversity of perspectives within the millennial generation.