It all depends. If he was in a suburban area, he shouldn't have been waving around a spudgun, unless he was going to put it in the car to take a drive to the country, or something else. The story doesn't say anything about this.
Another thing: the story didn't say what type of "spudgun" the kid had. I have seen a million little kids' toys that are "spudguns" that can only chuck a little potato slug about 50 feet, with a little *pop*.
And on a last note: it doesn't matter where you live, if your neighbors see you carrying around a weapon, or something that looks like a weapon, they are going to get nervous. Our neighbors almost freaked out when they say me carrying out my PL953. It's a target pellet gun, and it looks a lot like a .308 or something like that. I had to calmly explain it was just for marksmanship practice, as we had a postal meet the next day... and I live in HickTown, USA!!!