Oh man, good luck with that one. I’ve never had someone super into horoscopes that would stop being super into them, no matter how much you proved they were bullshit.
They will try to shiv you though if you keep trying.
I've found the best approach is showing a genuine humility and interest in the "lore" and "vibe" of it, the sort of witchy mystical aesthetic while keeping a firm understanding that you're clear it has no predictive power. People don't usually initially get into these for it's effectiveness but for other reasons
