Without really knowing the area and just judging from the video, I thought the OP was riding too centered as well. I'm not commenting on legality, and I think the sheriff was out of line as well, but I would have been further towards the sidewalk given what I saw. I don't think it was an especially big deal, there was another lane to pass and traffic wasn't heavy, but I rarely ride in the center of a lane unless there is a definite need. I didn't see one here. I wouldn't call the OPs riding position rude or out of line, but it's not what I would have done given what I saw on video.
I don't know the area, I don't know the customs or culture...or even the speed limit along that road...so my opinion's value is not especially high.