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In the nicest way possible, why don't you just mind your own business? What, exactly, do you think shouting at someone is going to achieve? Other than making you feel better in some way? (And it's normally people who always, always, need someone to criticise, in order to make themselves feel bigger and better, who get most upset about RLJing. You don't want to align yourself with that sort of sad sack).
The idea that you would do it to assuage the anger of car divers is really sad. Firstly you are projecting on to them feelings you don't actually know they have. Second, why become yet another person who shouts at cyclists in order to appease anyone?
If it's not dangerous, isn't affecting anyone (and you didn't mention any categories of red light jumping, just the act itself) then let it go. It's none of your concern. Even if it is dangerous, then shouting is still not the answer. Really, think about it: what's your New Year's resolution? I'm going to start shouting at people who do something I don't approve of. Why? BECAUSE IT WILL MAKE ME FEEL BETTER!
Commuter racer kept jumping all the lights, only for me to over take, stop at the lights and then he'd sail past again.
At one set he passed and I muttered "fucking idiot" just as he tried to put power into his pedals, but he unclipped and had a groin/top tube interaction. Was disappointed to discover when I got to work that my camera hadn't been recording this morning's commute.