Your mode of transport shouldn't reflect your attitudes to others, and in many years of riding bikes and going to rallies I have never had any trouble. At a bike rally, with bands etc, you expect to be up partying until late, but with a group of mates on a public campsite we, like your Aussie bikers, would be considerate to everyone around us.
That doesn't mean that you don't get inconsiderate bikers, they're a mix of people like any other group.
The only out-and-out discrimination I've ever come across was a miserable git of a landlord up in a pub in the Forest of Bowland, who refused to serve me purely on account of arriving on a bike .
Oh yes, and a very German campsite owner, who was fit to explode that we dared to move our bikes during "Mittagspause" - our fault, cultural ignorance meant that we had no idea what Mittagspause was - but she was truly a sight to behold, bright red in the face, waving her arms around and ranting about the English like a German Basil Fawlty, with us all stood there like little lambs with the bike engines idling quietly wondering what the hell had got into this woman and why was she so upset that we were trying to leave her campsite at just after midday..........
The national park that I worked in was popular for families and hikers. Having 30 hogs turn up was completely unexpected - but what was more unexpected was the fact that they really seemed to value what the park was about - far more so than the families that caused issues. I know who I would have rather shared a stubby or two with.