A set of social roles that have developed over a long period of time and have allowed mankind to prosper into a society that treats people equally. While equality isn't perfect gender roles have no rationally explainable play in it's obstruction.
Gender roles, simply said are nature's most practical answer to efficient sharing of the work load.
Nature doesn't care about feelings,
it doesn't care about
what you think is right or
wrong.
It only cares for survival, evolution and prosperity.
However, since men love women they have allowed and helped them to abolish gender roles to a certain degree and certain countries. This has drastically increased the rate of suicide, depression and other mental impairments.
The vast
majority of people, without gender roles, are not happy. Some selected individuals stand to benefit from it, that are happy with it.
The moment a goverment can not support this artifical gender-neutral environment anymore and people are on their own, gender roles will be back in full force and people will be happy about it.
Just because people have different responsibilities, different things they are better at than others doesn't mean that they are less important.