I think you're blowing it way out of proportion. I only wonder why they're hanging back when it's a flat straight road and they can easily pass. Not that I think they're plotting my demise, but I just want them to get around me and go about their day and I'll go about mine. Like I said, I understand when I'm pushing up a hill and they can't see over it, but there's no reason to hang back on flat straightaways, unless they're a driver who's not used to encountering bicycles on country roads. .