I think those people just conclude that they don't need to know. I do, occasionally. Eg, someone I don't know well recently said I care about my own happiness too much. I should focus more on making others happy. She said she could sacrifice for another and I couldn't.  Ok. Do I need to argue with her about that? What will it achieve? Does she even think that or is she just saying that to hurt me or try to get me to do what she wants? Or is she right? Who knows. Some arguments cannot be won. 

 Actually no, I'm just being blinded by her pretty face. She's 100% wrong. Attacking me for being selfish, hoping that I behave how she wants me to, is 100% hypocrisy.