I had a similar thing happen, I was positioned just like you were . . . but when the light turned green the guy in the right turn lane went straight ahead, then cut over (right in front of me) full throttle (apparently) so he could beat the two cars who were legally in the go-straight lanes, i.e. he wanted to go straight too but wasn't willing to wait behind those cars; and decided to race them instead.

I'm sure any consideration for me on a bicycle . . . well, I just wasn't a consideration at all.

People, I tells ya . . .