It's you and your friends who decided to make him an outcast by forcing him to choose to stay in a particular closed site when there are so many open options to

It's you and your friends who decided to make him an outcast by forcing him to choose to stay in a particular closed site when there are so many open options to organise meet-ups, including simply firing an email with CC/BCC to all parties. Even now there are still simpletons who don't understand the reasoning of those deciding to stay away of these sites. I'm saying just understanding it, not necessarily agreeing to it.