What is a real adult?

So Mason and Connor and I are riding in the car yesterday and this is what transpired:

Mason: Mom look at the huge bug on my window. It's HUGE!!
Me: (Looking at the bug on the outside of his window through the rear view mirror) WOW! That is huge!
Connor: Cool, huh?
Me: Very cool.
(At this point I begin to roll the window down and Mason starts screaming!)
Mason: What are you doing? It's going to get in!
Connor: Wow!
(At this point I am laughing so hysterically that I couldn't say anything if I tried. Finally, the window is all the way down and the bug flies away.)
Mason: Richard would never do something like that.
Connor: That's cause Richard is a REAL adult.

So my question is what exactly is a real adult, and it is wrong that I took this as a complement?