Isn’t this just human nature? A sociologist may be able to explain the dynamics of a group interaction and why one is left out of a conversation.
In the picture given it is sad when an old guy is ignored but could he be partly responsible? Would he want to see what the others are showing each other on their phone?
It is true that an outgoing warm hearted person would look out for him but maybe next week there will be an article about taking the initiative yourself to talk to others .