Well, I'm still putting together my first MAB, so I don't have any experience with rude bicyclists over that, but when one of my racing friends was putting together my hybrid pedaler, I commented how I just wasn't competitive.
He laughed and said, "Nonsense. You put two guys on bikes and put them next to each other, and they are racing."
At the time, I disagreed. Then, as my body started to get in shape and I started doing some twenty mile rides, I really, truly came to dislike anyone passing me. It was not so bad if it was a hyper fit athlete on a $4000.00 racing bike. I expected that. But when I saw guys around my age on regular bikes, I was all, "Grrrrr...."
Heh. It motivated me to get in shape. Pretty soon I was the guy making them go, "Grrrr..."
The Greek poet Hesiod said that there are two kinds of conflict in this world. The first gets a lazy guy off his ass, so it is constructive. The second is destructive and leads to war and such (Works and Days1.4). So being competitive is one thing. Being a punk is another.