I'm old enough to have had bicycle safety taught to me in elementary school (lots of kids biked to my school). I sometimes think I'm the only cyclist in Boston who gives hand signals (the standard kind that I was taught -- lots of people do give the rude kind!) Even as an 8-year-old, I knew to ride on the right side of the road (we didn't have sidewalks in my neighborhood).
Why don't schools teach kids anymore to ride bikes safely? Then we wouldn't have so many wrong-side lightless adult cyclists.