Interestingly enough, it's been experience that it's not the crotch rocket guys who are the worst bike bigots, but the dresser guys. Guys on Ultra's and Wings invariably think their way is the only way.
That being said, I think there are some good reason to avoid some bikes. I love the Triumph America, but I wouldn't buy one. I don't trust the dealer network.
I like my Harley Sportster just fine. I drive it up in the hills, and for 1-200 mile jaunts. Long distances, I prefer a car : )