I have a complex character in a story I'm working on right now. He is a former military man who is very capable, but also short-tempered and arrogant. He has a very "us vs. them" cold war mentality. The thing is, I don't want to just come out and say "This guy is a jerk." In the story I already have him cheating at a poker game and then throwing a fit when he loses, as well as killing an injured man who could have been saved at the end. This is the first serious writing I have done for years, so maybe I am a little rusty. What else can I do to make this guy unlikable? I want the reader to both respect and hate this guy. I have a few ideas but I'd like to get some opinions from others. Thanks!