Personally, the "show emotions" should always be reasonable and proportional to to the current situation, whether you are a man or woman. Children being the exception, as they're still learning about all this stuff, and their rational minds do not fully develop until 25 years.
There is value in not showing emotions when it would harm others. Little kids shouldn't have to deal with mommy or daddy's problems because it's traumatizing and damaging.
Life is suffering. Spreading suffering by inflicting baggage on others is emotional BS. One can learn to cope and deal with things themselves in constructive ways. This is one aspect of maturity.
It means that people act irritated and have angry outburst at moments unrelated to original source of issue. It means acting cold toward closed ones and children in particular. It means that blame gets placed pretty much randomly, at whoever is around and weak. It also means more of rationalizing of bad behavior and less empathy towards others.
Repressed emotion dont mean better behavior.
This cliche only hurt women, now it will hurt all of us. Repressed emotions meant people at least tried to repress their worst, but look at boomers and their unrestrained narcissism. Who can look at that and see progress?