Which came first the chicken or the egg? In other words, does he have a bad view on life because he saw bad things happen? or do bad things happen because he has a bad view on life?
Some people are bitter based upon their experiences. Some people are bitter based upon their personality. I don't think you can tell which is which without getting to know the person. Their bitterness may be temporary due to a painful situation that the person recently experienced. I suppose he just struck a nerve with you. That's fine.
I got the information that I was trying to obtain. Sometimes what I call information can be an annoyance for someone else. I just didn't see your comments as helpful. Whether they are accurate or not is to be determined. I can't say either way.