It's usually only in superficial relationships where arguments don't happen. In fact, if you look at your very closest, deepest ones, you might realize these are the people you have skirmishes with the most.
Yet often with our coworkers and colleagues, especially those above us, we try to avoid conflict. We may refrain from dissent or challenging their authority for fear of putting strain on the relationship. But relationships are like building muscle: you must literally tear muscle fibers, in order for them to repair and grow stronger.
The good thing is you don't have to seek out conflict (and you shouldn't). People naturally have different opinions and worldviews...conflict arises on it's own...what you need to do is stop intentionally avoiding it.