There's no question that co-worker relations can affect your overall job satisfaction. Negative co-workers can bring everyone down, while positive co-workers can help make your job worthwhile.
You can improve your own personal career development by being able to confront, and react positively, to your co-workers, whether good or bad. Don't let a negative co-worker bring you down and keep you from enjoying your job, or even jeopardize your chances for advancement.
How people react to situations says a lot about a person's character. Use professional judgement when dealing with any co-worker situation, and try to keep your emotions at bay. Spending so much time with people day in and day out can be stressful, particularly if the demands and pressure of your job are high.
Learning to cope with your co-workers can help you find enjoyment and satisfaction in what you do, even when the job itself is stressful.