In 2016 I don't think you can regard all newbies on this site as idiots. A lot of people with high ranked accounts have sold them, you never know if a newbie is really a newbie these days (hope I explained myself well here).
As you said, you actually never know these days if who is a newbie or who is a old user on this forum, because a newbie may buy a high rank account and stay in it which means he is a newbie but we don't know if he is a newbie, and also some users sell their high ranked accounts and start again with a newbie account which means the newbie is not a newbie but we consider him as a newbie.
Youre right, we cant judge a newbie as of now because some account have been sold especially to those have potential activity even they are newbie but the true user is a veteran so not all newbie are fools you can notice regarding to their post you can compare whos knowledgeable or not. So we cant consider newbies as fools.