Mr. Handley gives all sort of reasons for his allegations, reasons ranging from a comment that he found that refers to "Sullivan" as "her" to the fact that s/he never talks about his/her child to the fact that s/he defends Dr. Paul Offit at every opportunity to the fact that s/he is a person who is "smart, organized in their thinking, and extremely facile with complex medical terminology."
As an aside, that last reason makes me wonder who exactly he is talking about. The Sullivan that I have run across and who posts at Left Brain Right Brain may be intelligent but s/he tends to make rather glaring mistakes whenever s/he tries to deal with any complex subject.
Regardless, I have to say that while I won't agree with Sullivan on much, s/he does not deserve this type of treatment. I don't care if "Sullivan" is a humble father, Dr. Bonnie Offit, or a gaggle of evil pharmaceutical shills, it is not acceptable to attack the person.
So, Age of Autism, I think you owe "Sullivan" - whoever he/she/they might be - an apology. Let the poor guy have his anonymity so he can continue to spread ignorance in peace.