Sometimes you just have to let it go. If you can look at the situation and determine the person or group in question had no bad intentions and you have expressed how you feel, you have to ask yourself how important it is to hold on to the resentment?
Some people are able start fresh with a clean slate, approaching the person as if only from now forward counts. Others learn to accept people for what they are and accept their abilities (or lack thereof) knowing that no one is perfect. These people shift their expectations of what this person will or won’t do.
Try thinking of what they contribute to the team, to you or even to the world around them. Forgive them for not being what you want them to be and accept them for being who they are and what they do contribute.
Then move on! You will notice if you can take a moment to think about what that other person does contribute, you will treat them differently. Your non-verbal communication will be completely different. You will not feel as frustrated by them and they might not be as frustrated with you. It will help turn the relationship into something that can be productive rather then stressful.