#1 When arriving at a set of traffic lights on red, if you do bother to stop, ignore the queue of cyclists waiting patiently in the order they arrived at the lights. Simply go straight to the front of the queue past all of the people that overtook you on the last section and pull in front blocking their swift egress.
And there's also no rush when the lights do change to green. Simply begin to slowly wobble forward in your slow gentle easy style without a care in the world.
#2 The only reasonable time for having a go at a fellow cyclist for being "stupid and irresponsible" for "not wearing a helmet" is when:
a) you're wearing one yourself that is done up so loosely that, in the event of an accident, the straps of it would only serve to remove your ears before it eventually bounced off down the road.
B) and it's dark and you don't have any lights and a practically invisible
c) and then plowing through the pedestrian crossing with scant regard for the pedestrians trying to use it to cross the road.