I'm fairly certain that "me now" would describe "me then" as a little jerk. I definitely had an abundance of energy that I certainly let out in an annoying fashion. And there was a lot of property destruction due to dumb ideas (which I see a lot out of boys these days too).
These are just my general observations. Even this week, dropping my daughter off at golf camp. There were 4 girls trying to putt nicely on the green before camp started. Then there were packs of boys running around throwing golf balls at each other, damaging the practice holes and then they accidentally hit a girl with a golf ball before getting yelled at.
Another random observation - I have all these friends on facebook talking about their boys not wearing clothes and they post these pictures that are censored of them running around naked. Like what is that?? Tell them to put clothes on... My nephew does that too, and he's getting to be way too old to do it now.
My best guess is that given that parents are increasingly distracted by their cell phones (and I'm certainly guilty of this at times) kids more easily start to get a little out of control before parents realize what's going on. And it seems that the boys dream up more destructive ideas of fun than the girls often, haha!
Sorry, didn't mean to turn into an anti-boy rant, just a happy Girl Dad over here, lol.

HAHA!
EDIT: And I don't actually think a lot of this is malicious, I think they just lack self-awareness. I can tell you that was my issue as a young kid (no thought of consequences or who I was affecting...just a general sense that whatever I was doing was fun at the moment).