Have a look at this:
"Plain Catholics seek to separate themselves from the values of the secular world and to live their lives in the simplicity of the Gospels both in attitude and gratitude as well as faithfulness to the Magisterium of the Roman Catholic Church ut in omnibus glorificetur Deus ... so that in all things, God may be glorified. Plain Catholics seek to preach the Gospel with their walk and do not engage in doctrinal debates nor door to door evangelization.
When asked, they obey 1 Peter 3: 15-16
... Always be ready to give an explanation to anyone who asks you for a reason for your hope, but do it with gentleness and reverence, keeping your conscience clear, so that, when you are maligned, those who defame your good conduct in Christ may themselves be put to shame."
H/t to the Joyful Papist.