Sit behind screens - essentially to be hidden away. Disgraceful.
I worked with a Sikh woman once who has a disability and is in a wheelchair, and is an advocate for other south asians with disabilities. Until she pointed it out, it never really dawned on me how rare it was to see someone with a disability in the Gurdwara. And this is partly due to the lack of accessibility, and partly to do with the negative stigma placed on these people. Sikhism is progressive. However, some people who claim to follow it really have not reflected on their prejudices. We all have them, and must strive to understand and overcome them.