If bad RP was a bannable offense I have a whole heap of extra reports to make, including ones for some police officers.
But I'm pretty sure the rules are clear on this: RDM is the lack of role play when killing someone.
Ben clearly did not fall foul of this rule as he asked you to comply and gave you a time limit in which to do so and killed you only when he deemed you had not complied with his orders.
If your threshold of good RP differs to his then I suggest you have further discussion with him on where you think he lapsed instead of calling for a ban, which seems a bit petty in that light.