i think the couple in question may be hinting towards haqooq Allah vs haqooq al ibaad.
Now just because someone does one thing wrong, does not mean that person becomes a bad person or should nto do other thins that ar good. Otherwise every aunty ji in a sleeveless or short sleeve kurta in a mixed gathering should be slapped with a trout when she tells you she is fasting.
These people drink occassionally, fine, by doing so its between them and God. They may be forgiven, they may not be forgive, their good deeds may outweigh theri bad deeds including drinking or vice versa. None of us have that knowledge. In these situations, its best niether to encourage them or accept their habits nor to just drop them or constantly be on their case about it. Let them know you disagree with their choice, but its their business, and let it go.
