Anyone driving faster than you is a lunatic, anyone driving slower is a roadhog ;-)
On this basis I realize it is impossible to not piss off car drivers, but riding with some courtesy will reduce the impact, maybe have them moaning amongst themselves, loud pipe on full chat and passing close at 130mph is what gets them writing to their MP's, and noise will piss them off even when they aren't in their car, just relaxing at home etc.
Then the issue of scraping us off the road, pulling us out of bushes etc becomes a bit tiresome for their emergency services.
The B500 was "sold" by UK bike press as a free version of the "Ring", and UK visitor numbers soared, although I cannot be sure if it was "us" alone, as you do see a lot fo locals blasting up ad down, and the only accident I ever saw was some bloody expensive looking Porsche - looked like a lemans 24 hour car which had gone off the road and bounced back again and literally disintegrated, think it was all bodywork and the owner was OK, anyway...
....the "answer" to stopping people hitting trees at 130mph was to change the 60mph speed limit along much of the road down to 40mph in the hope the guys that are quite happy doing 70mph over the 60 limit would suddenly obey the 40 limit - but this just made us all serious criminals....
...maybe that was the idea, make it so shit that nobody wanted to come, however people still do, and now nobody has a clue how fast to ride / drive and everyone gets bunched up and frustrated behind the car that is sticking religiously to the new limits, and they in turn are now more pissed off than ever atall the people coming past them.
Add in that they no longer need our money, our swearing, our bragging in their hotels about how fast we are etc. as they have plenty of hikers and lycrists to fill their rooms and buy their food and drink.
Having said that I am going back this year, to solidify their belief we are also very stupid, all these anti-bike laws and we are not getting the hint.
I would avoid that bit of the B500, but got a mate coming who has never ridden it (there's always one that makes you do the Stelvio / B500 or some other over-rated road again) anyway, we will run (crawl) down it on our way in (havng been through the not quite so anti-bike Ardennes, Luzembourg and Eifel) and then loop around further south, on some of the lesser known / travelled roads, before heaing home via the Vosges - another place that now absolutely despises our ilk.
Might try the IOM next year, they seem to like us still, although a pretty short tour as the fast guys get around the place in 20 minutes, and even I can probably do it in under an hour - 45 mph average, I can manage that on a commute in traffic.