Is it justified to celebrate one's biological traits - for example International Women's Day?

[Loki, The Shape Shifter]

Being born female (or male) is a biological trait of an individual, based on the chromosome they inherit from their father - how justified is it to celebrate being of a particular sex?

BQ : Do you think it causes resentment to those people who do NOT get celebrated just because they do not possess those biological traits that are popularly celebrated?

For example - there IS an International men's day in November, but it is by no means celebrated to the extent as women's day is, infact most people are totally unaware of it. Does this make men feel resentful and unappreciated?
Another example would be, there being a Black history month, but no White history month. (but that's not a gender issue)