The closest word I can think of is a sycophant but that’s too strong word and not exactly what I’m looking for. The word I’m thinking of has negative connotations and it’s for someone who is friends with different groups but only at a superficial level and isn’t necessarily honest about who all they’re friends with. This person would be seen as untrustworthy.
Sounds like they are just doing their best to survive in an oppressive situation. If you can get in serious trouble for your beliefs it is normal not to be open about things that relate to that subject.