I think it's really allistic people who are less capable of consent. They have a strong tendency to choose their beliefs and actions based on herd instincts rather than rational evidence, while autistic people, despite our numerous problems, have a much easier time considering evidence rationally.

It was just yesterday that an (adult!) allistic friend of mine was posting on Facebook looking for advice on treating her kidney infection without antibiotics. Her irrational allistic friends were giving her all kinds of ridiculously terrible medical advice (“Alka-Seltzer cleared up my UTI”), and I looked up the clinical practice guidelines and yelled at her to GET ANTIBIOTICS.