Perhaps he's not "dumping" on it. Perhaps he simply doesn't want to hear you judge how other people live?

I understand you and, yes, we all judge people. ALL of us do it. Some of us have learned to not give opinions on how others live because people don't want to hear it, especially men (SORRY ALL MEN.....IT'S JUST WHAT I THINK)...

So, what about them getting a motorcycle is affecting you? Does she ask you for rides?

ETA...sounds like a half-day Kindergarten thing?

If so, then no, he's too young to understand any of this. Simple direction is all you can do at that age. And they have the attention span of a gnat.
He won't understand consequences and studying and preparing yet.....that comes when they're about 30...