I suppose from racing mc's for many yrs, a little bumping never bothered me. Id done it a few times at 100+ mph...a little rubbing on a bicycle just really doesnt seem like a big deal. Having said that I guess if I were bothered by it I simply wouldnt race. I didnt see an issue with the video in the other thread.

Edit after Creaky's post: any time Ive been in a race where a guy was continuously getting close to me Ive put a hand on a hip. Not a push, just a touch... No ones ever seemed to be bothered by it.