A problem for an autistic person is that they can become a foreigner. If you simply look at their credentials they might appear someone of intelligence and education and you might therefore expect them to know certain things. Not merely obvious knowledge that you would expect someone with their educational background to possess but about ways of behaving. Their actions and words might come across as inappropriate or rude and on that basis you might misjudge them. But they don’t usually do this deliberately.
You might expect that people should be prepared to learn what are the rules in a given situation and follow them. But it is not as simple as it sounds. In an individual instance it can be extremely difficult to know what are the right words and phrases to use. They might have seen someone act boldly in a certain situation and replicate that behaviour but it might come across at rude or impertinent elsewhere - or indeed even in a similar setting simply because of the way in which the autistic person has spoken or acted.
It is like trying to speak a foreign language idiomatically or understanding the customs of a new country. You won’t always know what is polite or rude in a given situation. There will always be subtleties that you miss out. The difference here is that usually people know that you are a foreigner and may be more ready to make allowances. They are more likely to realise that that you have not acted deliberately. In fact real foreigners are more likely to be able to fit in fairly quickly compared to autistic people due to shared cultural backgrounds.
I am reminded of the novel Daisy Miller by Henry James. It is a tragic story of a young American woman who scandalises her fellow Americans in Europe by her apparent disregard for the morals and manners of the time. In fact she is simply acting in a natural, innocent way and fails to understand how she could be doing anything wrong. The novel in my view is intended less a criticism of the social rules of that period than to show that failure to abide by them might not always be a sufficient basis on which base a negative opinion of someone.
Rules are not necessarily bad because they are strict but they will be easier for some people to follow than others. For many people even the effort involved will be natural but for a few it will end up overwhelming their true nature.