Exactly said, this are same reason people just get angry or hate others,for matters they might not really know more about just what they perceived or hear say, then they hate for no just cause,
I was telling a friend I actually love dialogue cause many people harbour things in their minds they should have let go a long time, and as you rightly said these things are just mare perception not necessarily true and so they hate
When they're room for discussion it's breeds understanding
As for me I don't harbour anything in my mind I simply let go and move on straight up
Dialogue also helps sort stuff out between people and come to a common understanding. Sometimes, that understanding is "we'll never talk to each other again" :)