If you're able to work it out between yourselves, there shouldn't be a reason for a player report. If the other party is being obnoxious and/or oblivious to their own rule-breaking and refuses to see eye to eye with you, then I don't see the issue with opening a player report. The whole culture of "no snitching" is lame. It's a game. People seem to have problem differentiating between their character and themselves.