Disability Discrimination Act:
"... harassment of someone for a reason relating to the person's disability is unlawful. It is defined as conduct that violates the disabled person's dignity, or which creates an intimidating, hostile, degrading, humiliating or offensive environment. Once again, this sits well with the positive duty to promote disability equality, because it is about how we can create a positive environment, even when it is not known whether there are any disabled people present"
The Duty applies to the owners of websites who declare that they are based in the UK for legal purposes or who can be safely construed as being so.
It especially applies when someone on their website has a learning disability/cognitive disability such as Asperger syndrome, where the level of bullying is proven to be 4 times higher than for other disabilities, and we cannot defend ourselves adequately when an attack gets personal, nor work out the dynamics of it quickly enough to make a good argument. (It doesn't help when we have people mocking their argument on this thread, for example). Therefore the law is now looking for a high level of responsible behaviour from service providers.
The current maximum penalty under the DDA is £500,000, or if a criminal harassment case against a particular individual with a disability because of that disability, it counts as an aggravated offence and can earn some time in prison.
Healthy debate, fine. But in disability issues we all now have to tread very, very carefully indeed to ensure that the debate remains healthy rather than intimidating, humiliating, hostile or belittling.
I think you'll find that thread is peppered with hostile and humiliating comments to those with a disability or about those whose children have a disability. I certainly find it so. I'm rather sad.