Maybe it is where I ride but it has never happened to me that someone comes up behind me and just sits there without talking to me. I'd find it rude if you where behind me for a few km without saying anything. I'd either slow down and make you pass or try and drop you. I ride out in the country so mayne this is the reason why. Or is because we are Canadians?

Does this wheel sucking with no talking/helping happen on MUP or something? are you passing hundreds of cyclists a day or just a few? If hundreds I could see the no convo, but if you out there and see 10 riders over a period of 5 hours then I would be ticked if someone came up behind me on a rural rode and said nothing.