I married a guy who despises having his photo taken, to a ridiculous degree. He won't even smile, which is so unlike him in everyday life because he's gregarious and funny but doesn't have the self-confidence to believe it about himself. So I don't push it, but sometimes when we're on a trip, or FOR OUR WEDDING, I like to get a photo of us to post and I'd tag him in it. He will randomly get triggered by this and tell me I'm "silly" for posting about what we're up to, so I finally just told him, "my Facebook is my account, I'm going to post whatever the fuck I want, and I just won't tag you anymore."
Now he'll see posts he likes and tell me to tag him in them.