It is about the fundamental opposition between the world view of Catholics and secular liberals:
That opposition leads to views of morality and justice in which drastically different claims and authorities carry weight. The Church values conscience, and accepts “this is right”—in general, this expresses the moral nature of a world that after all is God’s creation—as a claim that normally overrides other considerations. Today’s secular world values individual autonomy instead, and prefers the authority of claims such as “I want this” or “this is part of my identity as I define it.”
Furthermore, the "separate spheres" understanding of the authority of church and state has broken down, as the liberal state is now claiming authority in both spheres:
At one time it was possible to reconcile the two by saying that they dealt with different matters, the Church hierarchy with fundamental spiritual and moral principles and the state with worldly practicalities and standards of conduct generally accepted as a matter of vernacular natural law (otherwise known as common sense).
That view no longer works because of growing state absolutism resulting from the decline of transcendent religion and the sense of a natural moral order. All social institutions, including the family, are now viewed as state creations, so that determining what they should be in light of ultimate values such as equality and personal autonomy is considered a basic function of government. On such an understanding there is no room for the moral authority of the Church.
Modern liberalism sees the traditional Christian view as not only wrong but gravely so:
Secular society of course views things differently. From its standpoint the Church’s claims are not merely weak but outrageous. “This is right,” where “right” is presented as obligatory without regard to desires, chosen identities, or the needs of a public order that makes freedom and equality its supreme goods, is seen as an attempt to make the speaker’s outlook and preferences trump other people’s...Against that background secular society is coming decisively to view religion as a matter of private lifestyle and symbolism
What Kalb says next is very significant. He writes that unless Catholics are willing to acknowledge the fundamental differences, their point of view will either not make sense to a secular audience or else will be comprehended within the secular outlook:
Otherwise what we say will either be treated as incomprehensible or absorbed into the current secular outlook. A call for mutual love, for example, will be understood as a call for affirming and supporting the desires and self-defined identities of all people just as they are, subject only to the principle of mutual tolerance.
That was a very good example to give, because it is becoming so rife within the various churches. It is common now to hear Christians argue that the commitment to love one another means accepting whatever choices people make, i.e. accepting them however they wish to be as a gesture of inclusiveness, even if these choices run counter to scripture or longstanding church tradition. It is dissolving of the notion of moral good, apart, that is, from the good of unconditional acceptance and inclusion.
Kalb finishes by giving some suggestions for what Catholics might do at the present time. One of them is to live well:
it remains true that in a time of moral confusion living well is the best offense. People know that the current order of things doesn’t help them lead good lives, and if they see someone who has something better many of them will eventually want to know more about it. We should live in a way that makes that the natural turn for their thoughts to take.
I think that's good advice for traditionalists in general (though not the complete answer). If we become known as the portion of Westerners who best display the masculine virtues; who make good husbands and fathers; who are positive and courageous in their attitudes; who are magnanimous in the sense of rising above pettiness - then that helps to prepare the ground for converting young people in the future to our cause.