I'm completely baffled by statements of the form, "you shouldn't post about _______ on social media." I've seen the blank filled in with politics, your pets, what you're eating, religion, working out and a bunch of other things. Your social media presence should be a picture of you and what you care about. If other people don't want to see it, they don't have to read it. If they don't want to see anything you write about, they can hide or un-follow you.
I personally skip over any post about sports or God, but I don't resent their being there, because that's what those people care about. Post whatever you want, and I'll read what I want.