I don't think that's a fair reading of the post. They're not really complaining about particular friend dynamics where they're trying to keep information away from one friend while going out with another friend. The complaint is more about the society-wide change in norms brought about by social media. I don't think the author would complain about one close friend calling another close friend and sharing information about a trip the author was also on. The problem is that our modern norms (and tech) lead to everyone sharing everything with a large social network which includes many more people than an individual would normally be able to share stories with in person.