Something like that happened to me on my first day as an adult in Germany. Wide road, Sunday afternoon, visibility over 1km in both directions, not a car in sight. I was accompanied by a girl from the place where I was to work. I had just met her and she was showing me to the nearby convenience store.
She suddenly started screaming when I crossed the street while the pedestrian light was red. I didn't get what the problem was so I crossed back, to much drama.
She (or her boyfriend) later told me there was a long-running campaign during the 90s aiming to curb pedestrian death, that featured vivid TV spots showing kids die because they routinely saw adults jaywalking and imitated them.
So jaywalking = killing children.
Also German children of all ages are encouraged to say to jaywalkers "You're not a good example for the children.". It happened to me more than once.