It's especially fun when your 1 yo picks up a cigarette butt and first thing she does is reach to put it in her mouth. And, a few minutes later, a smoker throws a butt on the ground and DOESN'T EVEN EXTINGUISH IT. I freaked out that my daughter was going to try to pick that one up, too, as it was still burning and smoking. I stepped on it, used a leaf to pick it up (because, EW), and threw it away.
I wish I had the courage to say something to the guy, but I'm scared of the rage that LA people have, so I just passive aggressively said in a not-so-quiet voice how disgusting it was and couldn't people see that THERE WERE KIDS AROUND (we were actually at a kiddie attraction, so mine weren't the only kids around - there were hundreds.)