M Tiana - sounds like yr probs are with a slightly spooky runner, but may just be the usual inconsiderate muppet who's also a runner, I hope so.
Marty101 - worst case of inconsiderate runners I came across was one, no names no pack drill, a Billericay Strider, who thought it was quite ok after a 20miler to warm down back down the course and us slow joggers still to finish had to get out of his way!
Just to be different, my other half is a walker, and her main complaint is runners, for whom she always steps aside, just ignoring her, never a smile, word of thanks, acknowledgement, just head down and run.
Initially I questioned this, but then after reconsidering, realised that an awful lot of runners whom I meet going the other way, never smile, nod, wave or in any way acknowledge me, even when I step out of their way, or into the road to let them pass.
So perhaps its just a general malaise of modern society, certainly I always say thanks to pedestrians and nod/wave to runners, but often with a sotto voce "Well F*ck U", after I've passed them and they've blanked me.