Someone told me something once that helped me with a lot of frustration. In her words, we "make up a story" to explain other people's behavior, and our story centers around us. This guy has time to go to the bar but not to respond to you. But, if we knew the real story of his motivations it would make perfect sense. Everything we do or don't do, is because we perceive it is in our best interests. (Altruism can be in our best interests, depending on where "duty" and such fit in our world view.)

So this guy was doing or not doing based on what he perceived his best interests, and it had nothing to do with you.

I don't know if I explained that as well as she did. It helped me a lot to think of it that way, maybe it will help you. Of course, ranting is sometimes helpful too!