What is wrong with people

So yesterday evening I was enjoying a nice easy ride at west creek with J Ro, just cruising around and throwing a few intervals in just to see how the legs were feeling when I ran across the biggest idiot "cyclist" I've seen in a while. Now I know that you have to be somewhat "type A" to do some of this cycling stuff but jeezz, during one of my intervals I pass some guy (in his mind he was the "MAN") with plenty of room to the side, didn't buzz him at high speed or say a word to him and then I sat up out the aeros to fall bad to Jennifer when I hear bike creeking, tires scuffing. This dummy is out the saddle sprinting up to me and when he passes he yells"you wanna run, lets go!!!" what the hell was that? I couldn't help but bust out laughing on the bike and I hope he heard me, I know some roadies have egos but man, some of these tri guys think that they are Gods gift or something. I just let it go but the whole time I thinking all bumping and pushing stuff that Shawn and Jake have tried to teach me, hell I just with Jake was there so he would tell this guy, yeah, I'll run ya!!, and pass this joker laughing like lunatic as he dissappears. If this is the disrespect that is given to another cyclist that they don't even know, because I fully believe in talking smack close friends and riding buddies, how does he treat motorist?? Hopefully this will be the last crazy person aside from my team-mates I run across this week.