Yes, this is culture, right? Culture is part of reality. In some cultures one has to be careful how one dresses - especially if one is female - so as not to cause offence. In other cultures no-body cares how you dress, but they may be offended if you have the wrong political or religious opinions. All cultures have their customs, their expectations of appropriate behaviour, their standards of right and wrong.
One has to be sensitive to the culture one finds oneself in. But - at the end of the day - culture is only a reality created by us, by human beings, correct? So we can change it if we want to, if we have the energy to do so.
And if we can’t change it, then we learn to live alongside it - but without being false to ourselves. Right? But if my culture wants me to hate people of a certain religion or race, or kill animals, etc, then I may have to take a stand, or leave that culture behind.
But it is more difficult to leave behind the psychological world that thought has created inside of us - no? Because we are so closely identified with our inner reality. I think that is what K is wanting us to look at.