It's wrong to be rude and ignore people.
Ian and John are co-workers, and they are working together on a project.
John wants to do a good job on the project.
John works with Ian on the project, and they both contribute to it equally.
John ignores all of Ian's suggestions and does the project on his own.
Ian and John receive praise from their boss for working so well together.
Ian is upset and tells their boss that John is not cooperative, so John gets fired.