A lot of you seem to train on multi-use paths. I always avoided these paths unless I was running. At over 20 mph, these narrow, congested paths are dangerous. It's downright rude for a cyclist (serious one, travelling at serious speeds) to train on these trails. Perhaps it's location dependent though and in some places you have no other choice for training?
That being said, it's rude for anyone on these trails not to yield the right of way.
And wheel suckers are absolutely fine except in a race. Keep in mind that many of these guys only know cycling from what they've seen on TV so have no clue about etiquette. If we treat them as criminals then we aren't being very good ambassadors to the sport.
If they have hairy legs, so be it.