The issue is site-wide. As a comment notes, we have the "be nice" policy, but mods often need to remind members to do so.
A member that posts in the tone of "Are you stupid? It's perfectly clear to anyone with a brain", isn't likely to stay a member for long, and if they try to, often create a lot of work for the Mods.
To answer your question (admittedly, from my view at Money.SE) the mods and members alike try to edit when the intent is clear. When it's not, we try to ask the OP to help upus understand. Ideas to do it better? Just lead by example. The tough part of this is the lower rep members who might not catch on so quickly, their behavior might take some time to change a bit.
To clarify, high rep members might still be nasty, but they should know better.