Heck you don’t even have to make comments.
Some “Friends” will notice if you don’t “Like” some pro-sodomy comment or link. I had one unfriend me because they noticed I never “Liked” any of their liberal propaganda that they posted.
I’m sure you don’t count that a big loss. I know I certainly wouldn’t give it another thought. My most prolific lib Facebooker is on a jag of using Bernie Sanders quotes. I let some pass without comment but never fail to use “commie” when I do respond to a Sanders quote.