Scot McKnight gets asked this a lot... here.
How do you handle critics in general, let alone ones of a very aggressive nature?
Personally I have found humor to help greatly. Praying for them is also highly suggested. Mostly realizing they are just as screwed up as you are helps... (By that I mean I am!) = )
Mostly do not let their bitterness and anger infect you.
“Culture is only true when implicitly critical, and the mind which forgets this revenges itself in the critics it breeds. Criticism is an indispensable element of culture.” Theodor W. Adorno
(German philosopher, 1903-1969)
Here are a couple of posts I did on the topic of handling criticism.
What I learned from my critics (Sort of a bitter one)
Some Advise for Handling Critics and False Accusers (A much better way to go!) = )