I dont really think its an assumption. I think its basic fact and it goes well beyond the escapist. As an adult I can look back on my teenage years and see where I was an obnoxious prick. I cant help to wonder why someone didnt cave my head in with a rock with some of the garbage I pulled.
However, it is also a matter of perspective too. We live in a day and age, where ideally it is expected that our children will be better off than we were. I remember growing up living off commodity cheese and peanut butter. Yet the kids im responsible for have absolutely no problem whatsoever to waste food. Kids also break things too. I did it when I was a kid, I see my son do the exact same thing. However I think it is representative of this generation coming up, as some one else put it, the generation of entitlement. For example he YLOD'd his PS3, and broke the pin inside the power inlet on his PSP within the same week, and his reaction was, Oh well, Ill just get a new one.
All of this goes back to the studies that have been done that show that chemically the brain of a teenager is not balanced the same was as an adult. They are illogical, irrational, and abrasive. Its not their fault, they are just migrating from the body of a child to the body of an adult, so of course things will be out of whack.
I think if there is hatred toward teens on this forum, it would likely revolved around people saying things without thinking, posting generally abrasive posts, and making an obnoxious presence felt. Fact is age or maturity has little or nothing to do with that, because anyone behaving in that manner is likely going to generate the same aggro, regardless of their age.