I feel, it is more than just "afraid of being disliked", there are feelings such as "you will not understand me because you have not lived my life and therefore I just keep away". There are feelings such as "I dont like your opinion/thoughts about xyz, therefore I just be by myself". These could also be because of how our society has evolved over time, 'more' violence or getting-aware-of violence due to technology etc...

I feel our decisions are based and influenced by many combination of feelings.