This question is an awesome rorschach blot for the answerers ethics and morality. I've worked with people that had answers regarding this all over the place.

This question is an awesome rorschach blot for the answerers ethics and morality. I've worked with people that had answers regarding this all over the place. My answer would be that it depends on context. You could qualify "doesn't work" with all kinds of qualifiers, that they might or might not do, such as take credit for your your work, take credit for others work, interfere, steal, harass, block, distract, etc. You could also specify a counter party for each of those: coworkers, management, the company, vendors, customers, or the public. For example, do they steal money, property, or time from the company, coworkers, or customers? In my experience the people you work with will have all kinds of different answers, that are sometimes surprising. Some people never say anything to management or their coworkers, even if the culprit was stealing property from customers or the company, and only draw the line if it was them personally. As a meta answer, we could try to construct levels of morality necessary for different levels of cooperation and trust to be achieved. Anyway, if your coworker doesn't take credit for your work, steal, interfere, harass, or otherwise block anything, then you are more in a case of thinking about the relative fairness of the situation. Recognize that and put it aside. It's not useful to you. If you end up in a situation where it's impacting your ability to get a significant objective done, then it's material and you should focus on practical ways to work around them, for example by working with other people or making it so they aren't in the decision path.