I'm autistic, my partner is autistic, and I work for a disabled company so work with autistic people every day. None of us would do this. Even my dad who was a very classic case of undiagnosed autism and did tons of stuff that NT society considers rude, didn't do that. If anything, many autistic people are aware that we're living in an NT world and are very careful to monitor our own behaviour in order to fit in. (Especially ND women, who have a far higher tendency to mask). The post above about being s anxious about being seen as babbling on that you shut up and wind up being perceived as stand-offish, I identify with that very much!
I also know people who are very definitely NT who do this, because they're just entitled and think being a bloke means they have a right to dominate every conversation.
There's a big difference between a stereotypical autistic hyperfocusing on a specific obsession and sharing info about that thing, (or doing the "sharing empathy" thing mentioned above), and monologuing on about your own life because it never occurs to you that other people might want to speak, and you take no interest in what others have to say. I once spent half an hour at a party going through every single one of the Plantagenet rulers and how they lived and died, which is a super aspie trait, but I made sure I wasn't boring anyone and not trapping anyone in the lecture who didn't genuinely want to be in the audience. I mean it came up in the conversation related to my work and I framed it as "okay I'm going to do my Ted Talk so sit down, anyone who wants to listen to that" rather than just launching into it. So people had the ability to opt-out. And I kept checking that people wanted me to keep going. That's the difference.
In my experience, it's older men who do the latter, and they do it largely because they're twats who have been raised to believe the world revolves around them.
As an Actually Autistic person I find this thread very ableist, but not the OP or others saying the behaviour is rude/annoying. I find all the posts acting like autistic people have no control over their behaviour, and that anyone who has a problem with it is just a typical Evil NT and they need to put their own needs aside, those are the posts I find ableist.
One thing I've noticed in Extremely Online spaces (and not in real life, or rl disability activism circles) is the phenomena of Terminal Uniqueness. There's a lot of people online who basically take the attitude of I Am Special Because I Am X, ergo everyone else needs to bend over backwards and mould themselves and their behaviour to me and only me, or they're a bigoted anti-X. Without taking into consideration that tons and tons of people are also X, that the person they're offended by, might easily also be X. There's a real trend on certain social media sites for people to act like they're the only autistic person on the planet and anyone who doesn't treat them in the exact way they want to be treated is a mean evil neurotypical. When the other person (bearing in mind this refers to interactions within these specific social media communities) is most likely also autistic. I think there's something about the Internet and people who socialise near-exclusively online that reduces the ability to see conversation as more than speaking at each other.
We are all individuals. Autism is not a hive mind. Yes there are typical autistic traits, but autistic people still have personalities in addition to being autistic; being autistic is not a person's whole entire personality. There are autistic people who are lovely, autistic people who are shy, autistic people who are extroverted and brash, autistic people who are arseholes, autistic people who put a high priority on caring for others and being empathetic, and autistic people who couldn't give a shit. Just like non-autistic people.