why can't there be more than one gender? who's to say gender really exists? sex, sure. that exists. but gender? in a society as advanced as ours, are gender roles really necessary? perhaps they once were, but with technology the world has changed. what is gender? is it possible that it could one day become obsolete? would that be so bad? why do we fear change?
It's not the fear of change, its the fact that it will become a cesspool of people getting angry and going full white school shooter because you didn't get their right "gender", Society is in no way, shape or form advanced or mature enough for this change to happen, the number of things that would need to change is more than just gender roles.
You can't change basic biology just because some people want to "feel" different and unique.