i agree that the undue care should be the other way round
imagine the scenario if it had had no-one waiting at your lights and you arrived at them as they turned green
you would have gone through quicker (though you would have slowed somewhat) than you probably did and rightly
when turning right across oncoming traffic you may only do so when it was clear to do so
more so at a lighted junction
fight it
and claimfor your damaged bike and injuries against the other driver
need any further advice call me and i will help as much as i can