BN Hawks

So, I created an avatar with tools that are available to everyone. It is on a Sonic themed Sim. Coincidentally, another avatar approaches me, looking identical, saying that I copied his, when I did not. The materials are available to everyone and there is no sale or marketing of anything involved. Does this avatar have the right to tell me that I cannot have mine looking like his even though this was not intentional and nothing is for sale? He is telling me to not use this avatar because it is one he came up with. Thanks for your advice.