> Running red lights and not stopping for stop signs is the worst. And it's pretty universal.
Some areas have a yield at stop signs law for bikes so the stop signs could be legal, but I think a major driver of this kind of behavior is bike hostile infrastructure. If you've stopped for your 20th red light that prioritises non existent car traffic and that won't turn green today, or you're going past your fifth intersection that requires crossing at signals 3 times, waiting 2 minutes a piece on an empty road with visibility 500m in each direction it starts seeming pointless. Once someone is in the habit of disobeying clearly pointless (or in the case of many stop signs, actively unsafe because there is no visibility at the sign and accelerating up hill from a stop rather than 2mph causes you to spend far more time in the danger zone) signals and signage I can see it being easy to start ignoring others.
Respect works both ways, and when your city and laws clearly disrespect someone you shouldn't be surprised they stop respecting you.