I'm going to bed after this.
of course its better to post kindly, unjudgementally, and definitely in a non-abusive fashion. of course
I normally avoid AIBU because I think exactly that, tbh.
But banning people is not the solution. Condoning rudeness isn't either.
Why on earth aren't we considering the other suggestions here? Posting a warning on a thread? Clarifying (on thread/site) what constitutes a personal attack?
There are some cold, superior, horribly 'polite' posts I have seen over the years that are far too careful to get banned - but just as hurtful and terrifying as anything DBF or others on the DogHouse have posted. And plenty of dominant characters that others are afraid to contradict! DBF is just a bit more noisy than some of those - and far more likely, as a result, to draw attention to herself.
Its not ok to shout at someone who knew no better. Its not ok to scapegoat someone who doesn't know how to not shout, either.