Not every opinion needs to be shared in the moment. Some land better after the meeting, one-on-one.

In a group, disagreement turns into performance. The other person has an audience, so they defend their position instead of considering yours, and what you said gets filed as a challenge. The identical sentence delivered quietly afterwards is just information. Your point did not change, only how much face somebody had to protect while hearing it.

Hold one thing back in the next group discussion and say it to the person alone later. Open with the part you agreed with, then give the actual objection. People say yes in private to things they fought in a room.