Hm. Well, I probably would be more understanding to people who are roleplaying their distruptiveness, over people who are just being disruptive period.
For example, the stand off between House Cheshire and Klyros Junction yesterday (my time) in front of the entrance to the arena. That was somewhat disruptive roleplay, but no more than say a picket line in front of garbage disposal areas. I can respect that disruption of not being able to complete a quest, if I am aware of what's going on. For all I know, it could just very well be two different guilds standing around, not a picket line. However, what was annoying about that was that characters who were not involved in the confrontation, were also not allowed in. This is the type of 'allowed' disruptive RP. I really can't think of one that shouldn't be allowed at this moment, but I'm sure someone else might be able to catch onto what I'm saying and provide an example.
People who are being disruptive, outside of roleplay, I tolerate less. For instance, players who run into Kada-Els with weapons drawn, and even though you mention, in brackets, that it's common courtesy to sheath weapons in the tavern, they still refuse to do so. And then proceed to propose marriage to the character (true story). What was unique about this situation, was that the player had been told, not even moments earlier, by the Hydlaa guards, to sheath his weapons in the city. Ignorance and just not knowing the rules are understandable, We've all been there before. But refusing to listen on more than one account is blatant disregard, and probably should be punished.
In terms of whether or not these things should be policed more, ask yourself what would happen if I did this in real life? Would the police be called? Then give or take a yes or no for medieval times (or at least what we think would happen during that time period). Would someone be thrown in prison for brandishing weapons in the city in a medieval time? Yes, that would be the least that happened. Remember, people have been beheaded for less in those days.