I have a more nuanced view.
The community benefits from new editors who are acting in good faith and willing to learn.
I agree that treatment of new editors can be problematic.
On the other hand, having become one of the "insiders", I now understand how English Wikipedia has a limited supply of skilled labor from volunteers who are trying to defend Wikipedia against vandals, conflict of interest editors, copyright violations, and other problems.
There is a WMF team working to improve the onboarding experience. I'm cc'ing Marshal Miller (WMF) here in case he would like to comment.