The man was abrupt but not insulting. You may see not conforming to common niceties as rudeness, or you may not. Depends on your point of view. If you see his behaviour as "dickish" then the right opinion is to say that the behaviour itself is dickish. However, to conclude that the man himself is a dick is a shallow opinion. People sometimes act on emotion and there are many factors controlling someone's behaviour that are not always rational. Judging people based on one action is not optimal.
Giving someone the benefit of the doubt is not becoming opinionless.