It's also more hostile than I remembered, but oddly people use politeness as some weird passive-aggressive pulpit to combat each other. Replies and comments get seen as personal attacks and others quickly get dismissed as trolls. And when the simplest solution to dealing with anonymous people on the internet vying for fake internet points is just to leave well alone, some -- especially nicks I've seen around from five years ago -- have decided the best way to react is to respond. And poorly at that.
It's very much the same catty atmosphere I've encountered when hanging out with my art school friends and their cliques that they endure for their art.
But then again, it's the same eternal september problem that was discussed back then, regurgitated every year, and now we're here.
That said, there are good signals here and I keep seeing the same advice that people give: ignore the noise. But the challenge is two folds: what is noise and should you really be ignoring it?
The first is relative, you decide you own level of involvement but I do have opinions on the second question. I don't think it's right to ignore the negative comments. You can't improve your craft living on good vibes and hugs. So understanding that this place, relative to the rest of the world, is different place, it's both a sanctuary and a padded room. So take the inputs, review them, filter them, and prioritize them. Never internalize the hate but at the same time don't be naive.
PS: 17 is young but it's not that young. When I was in the Marine Corps we gave 17 year olds guns and entrusted them to be men and women that can get a job done when need be.