Weird and uncool. If they think your private life is social media worthy, then their private life is also social media worthy. Adress it in the group chat... what if you sent pics of them peeing with the door open in he group chat... see how the feel about thatt. My belief: Don't do unto me what wouldn't be done unto yee. Also, welcome to adulthood where you get to choose where you draw the line. I know seeking validation from other is comforting, but sometimes if it doesn't feel right to you, don't wait for the poll result to come in, say it and/or act upon it. This is how you will build confidence in your own judgement. Finally, don't be too drastic or unilateral. I find that reasonable demand done by reasonable individual are often met positively. Ask for what you need. Best of luck.