But on the other hand, the reason maybe not his personality, he perhaps just lacks the experience for interview skills. One of my friend in China alwasy failed the interview with the same supid attitude. He always discussed deeply with the interviewer of one special topic and sometimes even argued with the officer. Then after half years passed by without finding a job, he may experienced too many failure on job searching, his way was changed. He was thinking about himself and reevaluated his capability. He did not sustained the critical manner and find a good job soon. The very important thing for a job seeker is that he should be kind and easy going just like what you have said and try to leave a good impression to the interview. By thus if currently there are no postions for him, maybe the opportunities will be in the future.