...your worlds have collided, and there's not much left to do unless you want to redeem your relationship with your brother. Keeping both worlds separate might not bear fruit with your family, but exposure to well-intended but decidedly pointed comments by friends might very well push you further apart. For the sake of the slightest possibility of bringing them around, it might be more prudent to exclude them from public comments about them on line; a Dorothy Facebook page that expresses how you feel without the risk of upsetting them further. It might seem like patronizing, but as the old fable goes, you can gain more influence with persuasion rather than force.