I call BS on this one. Every biker I know says a car handles quicker under emergencies than a bike.
As a biker, I'm going to agree with the GP on this. I think there are a number of factors: a) On a bike you tend to stay much more alert and aware of other vehicles. b) The average skill of a biker is higher than a car driver. c) You're only 3 feet wide. It sure makes dodging easier.
I've been in a similar situation, I was going down the road at 40 miles/hour, and a car pulls out of a side street into my lane, stops. Leaving it completely blocked. The only thing I could do, was go into the oncoming lane to get around the car. Fortunately the oncoming lane had moved over just enough that I missed them. I miraculously made it through with only inches on either side. Had it been a car? I would've ploughed into the idiots driver side door (and probably killing her). Or maybe my reflexes would've caused me to try dodge the car, and have had a head-on collision.
Yes I'm aware these are just two datapoints, but perhaps you could quit with the jerk statements:
You don't really have a bike, do you?