I see people receiving a lot of shit in game over their voice or behaviour but most people go to the argument that it is just a game, something that I agree with for the most-part. From my understanding, there are a lot of situations where people are like this in real life, especially towards police officers so it's not that out of the question to allow it in character, most of the time. In very rare situations, you could consider someone being that much of a prick in character to be excessively negative to you, hence breaking rules. Such situations would only really occur if someone would actively follow you around for hours, giving you so much shit in character that is disrupting your role-play and actually beginning to hinder your enjoyment of the game from an OOC perspective. Of course, the most an administrator can do about such a minor infraction of 2.5 is to possibly verbally warn them to stop. If someone is seriously going out of their way to give you grief IC, with no valid reason, I would look to reporting it for 2.5 and it might stop; being overly malicious can be caused by OOC grudges so it should probably be looked into.
tl;dr: report it for 2.5 if it gets over the top