The State has ears everywhere./sarc
Be polite, be firm, and don't back down. Document all interactions with the state.
In groups where you don't know the people, do same, but exercise caution.
“Honestly, I tell people to not post things on the Internet, or talk about them at home.”
Unfortunately you are right, however, this is exactly a communist system wants and needs.
Spreading fear in the citizenry will minimize public opposition, the communication between people and most of all erase the trust between neighbors and even families.