I don't see the need to kink shame....? Like it's none of your business what people do if both partners are consenting
My mom and dad did some crazy things (including but not limited to communal genital leeching (only one or two leeches at a time, though - more would have removed too much blood for proper member function), aggressive sounding (aggressive is a relative term), rope-play, and yes, adult breastfeeding (often involving self-breastfeeding (my dad actually had hormone treatment that allowed him to produce a minimal, but still-sufficient amount of milk that he could fill half an 8 ounce glass with))) and I always respected them for it, because I have my own similar kinks and fetishes. So what? It's not like I'm engaging in illegal activity or infringing on anyone else's rights.
I guess I would say that it's a bit unusual to post on Facebook about because more often than not, people should keep these things as much to themselves as possible, but it's fundamentally a personal choice, and I think everyone should be able to respect that.