From my visualization of the maneuver, based on the OP’s description, this individual is the poster child for cyclists whose exaggerated sense of self-entitlement creates animosity toward the rest of us.

The cyclist had three viable choices for executing a left turn at the intersection:

1. Make a vehicular left turn

2. Make a pedestrian left turn, travelling past the line of vehicles waiting to his right, positioning himself at the corner, and waiting for the signal to change

3. Make a right turn before coming alongside the line of vehicles, then a U-turn where appropriate/legal to come up in line behind or to the right of the waiting procession.

Instead, he butted in right at the front of the line, clearly violating all the waiting motorists’ rights-of-way. This arrogant, selfish, and childish behavior erodes respect toward those of us who try to ride like grown-ups.