social alienation caused by the internet and the social media usually manifests in asocial behavior like withdrawing from the society. in the recent years people have started calling this anti-social behavior, and they often get corrected by pedantic people such as myself.
what BBC meant by "anti-social" in this article is unclear.
Re-read the reasons it enumerates for moving genuine social interactions to E2EE platforms, or at least 24 hour self-deleting posts.