I would usually not talk about OMNI/PR stuff in public unless I'm around like-minded people. I just don't feel like having regular debates on politics or religion.
For single meal DOs I find that most of the conversation is spent actually talking about miles/points/travel or just basic meeting new friend conversations.
The weekend DOs obviously have more opportunity for conversation and I've only been to 1 of them, but it seemed like all I've had the opportunity to do so far is just repeat my loyalties to everyone and discuss the common programs.
I grew up in a family where politics were not discussed openly. I discuss them often on OMNI, but I do not discuss politics with people I just met.
There are people on OMNI/PR who I really agree with and people I don't, but i'm not sure if the first topics brought up would be threads from OMNI/PR unless it was a private conversation. Those topics are just not appropriate to me in public conversations.