Dating someone who constantly posts pics for attention on social media is like being responsible for a retarded goblin who is never fully present and you aren't just dating them you are also dating their audiences expectations. The dynamic shifts from sharing something together with you, to performing for strangers. Your role shifts from partner to photographer. Vetoing a post risks not appearing supportive enough. It infantilizes the dynamic when someone can't exist without posting. Heavy posting signals deep insecurity.
Life is too short to manage someone else's highlight reel, and when I see couples in public where the girls boyfriend basically becomes her photographer, I just laugh. The photographer boyfriend is peak emasculation, waiting for the perfect shot while strangers get the curated version first. Push back and your controlling or not supportive, go along and you're complicit.
Lose lose situation, and they think they are winning because they have a GF. Okay 👍