Yes, OC can be applied in a negative way, although it mainly refers to the creativity. Some people may use OC for the purpose of bullying or ridiculing others, especially in fan communities. For example, they can create bad representations of somebody else's character or make use of OC to spread negative messages. The OC meaning may vary according to the context, and it is important for the users to be careful about how they represent their characters. Thus, positive interaction and respective sharing will never leave a chance for misuse of OC. So whether OC is meant for creativity, it still needs to be in a responsible and friendly manner.