a) Sure the internet has changed kids - I was as skinny as a lath when i was a kid; now look at the little lardarses!

b) Kids always behaved fairly raucously *among themselves*. Now the discourse is often between children and adults in mixed company, without the children being able to actually see that they're speaking to an adult. So they behave in the same way as they do with their mates - much like a bundle of puppies, rolling and nipping and squealing.

If you want courtesy from them, behave a little formally; you could also bring a little realism to this by posting on the forum "I don't expect to be addressed like this; this time I won't inform the moderator..."

(As an adult, you're allowed to be a telltale ;)