Hmm...I am disregarding all the "fuckboy" comments...and moving towards the original question. I think.

It was not a race. There are no races that start with a van in front of either participant. Races are typically from a stop, and the competitors go when the light or tree turns green. There are exceptions, as in Gooney Bird races. See the good Dr. Dirt for an explanation on this one. But it usually involves a Supra with a fuckboy driving it. Dammit, I tried.
No, you didn't lose, because there was no race. See above. I think the van driver lost a day or too off his/her life do to the noise both cars were making.
You are probably not an asshole, just have been emotionally scarred by someone or something in an Integra at one time. The egging them on part, was done while you were behind the van?..hmmm Maybe you are an asshole. But, I wasn't there, so really can't judge your assholeness based on just that. My advise? If you have a decent Yoda--it's gonna hook, wait for them fuckboys (dammit!) to come around again, but wait till you both are at the front at a light/tree. The best way to shut up screaming fuckboys (FUCK!) is to hand them their collective ass in a race. Works every time, better than BC powder.