This is interesting. I have always found it odd the way that some animal rights organisations express their desire for humanitarian treatment of animals through campaigns that show a sickening disregard for the humanity of anyone other than themselves. The campaign linked there is a good example, they disapprove of the well being and feelings of animals being compromised in the name of some grand cause (medical research) but have no compunction with heaping even more stigma and distress on autistic children and their families to further their own cause.
Incidentally, since reading Bad Science, I've not been able to take statements like this on face value. Whilst I don't doubt this is a good thing, it took me ages to read through all the meta analysis abstracts to check the blogger's assertions that PETA's claims were wrong, which is a pain. There has been almost no credible research on this subject, and the results of that were inconclusive at best (the most scientifically rigorous of the studies only had 4 participants, which renders it pretty meaningless).
As a thoroughly uninteresting little side note, it's the association with that sort of crap that stopped me from ever describing myself as a 'liberal' on facebook.