Gender reveal parties. Boys don't cry. That color is for girls. That bathroom is for boys. That sport is only for "real" girls. That's not the right clothing section, toy, partner, door, major, job or life for you.
We are taught before we are even born that there are strict rules in life based on whether you fall into the blue bucket or the pink one.
If you happen to not fall neatly into one of those two limited buckets -- and an increasing number of people do not, with 6 in 10 Gen Zers saying there should be more than just two gender options on forms, according to the Pew Research Center -- the potential challenges are many.