I don't really understand the point of bringing age into their argument ("overly eager teenagers"), but I tend to agree that DDoSing IRC servers is the lowest form of low. Let us idle in peace!
I've phrased it with "probably"s on purpose; every once in a while a teenager will manage to escalate to the "true threat" level. However I think it is likely such a teen will either A: tend to show up by other, more practical measures or B: slip through a crack regardless; it doesn't justify harassing relatively innocent and frankly naive users, for what is probably little more than the purpose of padding numbers to make your enforcement look good by going for cheap, easy targets, regardless of whether that's good for anybody else.