I once had a friend who was a muslim, she was a MASSIVE liberal, like extreme. In the end the friendship just fell because she was just too extreme with these liberal stuff and would push them on me and in the end I told her where to go and deleted whatsapp, and blocked her number. She was a good friend who I could laugh with, and who did give advice when I needed it. But in the end she got too extreme and it was a nightmare.
I don't know how to deal with it with people in person. I just try to avoid them, avoid the subject and be nice to them. Like, as long as they don't get in your face over it, it's fine. But some do, and the ones who are a NIGHTMARE.
Who I REALLY hate are the liberals who start to hold grudges against you because of what you believe in.
That's actually a good reason to keep your friendship circle on facebook small, I've always tried to make it big in order to look cooler lol. But your way is better, some of the "friends" I have on facebook, I hardly know them. I know them, but not good.