Having societal expectations of what is expected of your role as a certain gender is not unreasonable
I agree with your statements and their sentiments.
However, in the context of this op, it is being used to humiliate and/or change the nature of someone thru negative opinion.
Societal expectations are just that...societal.
They establish general guidelines for the entire selected society.
This is a good thing to unify a society.
The problem is, lately (the last 75 years or so) societies have not been the ones making the social changes.
Society has relinquished control to media influence. This means the media now dictates social changes, not the society. Society has moved from control to acceptance.
A person has to be very dense and gullible not to see it. Over-exposure to media and entertainment is what dictates social norms.
On topic...
The United States is a mix of cultural and religious societies made up from individuals with different social beliefs.
With advancements in communication, people are also influnced by world cultures and religions.
What a society in India defines as a real man is not the same as how someone in the US defines a real man.
Plus, how someone in LA defines a real man is not how someone in NY defines a real man.
This misalignment of social standards breaks unity and society flourishes with unity.
To determine actual social standard requires a society to be isolated from outside influence.
No media no outside communication...for an extended period of time.
For example, the removal of all electricity for a full year might result in a very different society.
Look what happens within societies after a mega disaster.
Nearly anyone not suffering from delusion realizes there are only two human genders, man or woman (in most cases but there are over-population genetic mutations).
If you are a male...you are a REAL man.
If you are a female...You are a REAL woman.
Anyone who tries to tell you that you are not is trying to manipulate you.
Its YOUR choice to let them...OR NOT.