True friends are not just those whom we trust but those with whom we share a comfort level. Recently I noticed that we refrain from speaking our words aloud not so much out of fear of misunderstanding but out of an attitude of "why bother? "
I mean ofcourse we should given an opinion if its something vital ,but true friends are those whom we value enough to argue with them even over mundane stuff. Stuff that doesn't really matters to either. It could some stupid movie, some book, one third person, anyone. Mostly neither is able to convince the other about their opinion, but both feel good just to share their thoughts, even about random stuff. That's comfort level.
So if I argue with you, just remember that I value you :)