Her comments were echoed by Emily Banks, founder of neurodiversity training body Enna.
"To be clear: being autistic is never an excuse for misconduct. It doesn't absolve anyone of responsibility, and it certainly doesn't mean you can't tell the difference between right and wrong."
Dan Harris, who runs the charity Neurodiversity in Business and is himself autistic, said people like him "may miss social cues sometimes".
"But autism is not a free pass for bad behaviour," he added.
"Comments like this stigmatise us and add an unfortunate negative focus on our community."
Last year, the charity Ambitious About Autism dropped Wallace as an ambassador in the wake of the original claims against him.