Communication is the most important part of social relationship, however, 99% of the talks between me and others are low-quality without interaction.
Most of the talks are the words from two mouths instead of two independent minds. The most common pattern is that one is leading the whole communication complaining about something and the other totally echos his sentiment, like the following way:
B: "Yeah, you are right."
B: "Yeah, he is so wrong."
When my sister broke up and came to me, I said nothing about the true problem is her character but blamed for her ex with her.
When my classmate messed something up and came to me, I said nothing about the true problem is her ability to learning but compliant the work with her.
It's hard to say "I disagree with you .. you are wrong .. you should be blamed." with a person who doesn't look for an objective justice but a listener totally "understands" him.
Maybe most people think it's fine to be such a sweet and kind listener when your friend comes to ask for help. Doing so is called being nice. No one wants to take responsibility to break a relationship to express disagreement.