1. I didn't insult them, I did criticize them for over analyzing the characters on a "slapstick" like comedy manga with a romance undertone.
2. Nowhere did I use autism as a insult. That you read it as that, says way more about yourself tbh. I made the comment cause some really explained a social situation where I think that someone with Autism might think like that, but not realistic in actual real life. Banter between friends is pretty normal. So if you make 4 alineas about the FMC being jealous and purposely want to hurt the MC and to make him look bad as possible, yeah I feel like you have autism/bad social skills.
You deride people's interpretation of Machino's treatment in this chapter and then go on to accuse them of having a neurological condition.
That's using it to disparage their character for engaging with a story in a way you don't agree with. Sounds like a pejorative to me.
And yes, Machino
is behaving differently this chapter than she has in the previous 6, and that includes the time it was more than just the two of them alone in his clubroom.
The "banter" they've done would be those previous 6 chapters' worth of content. Even if she poked fun at him, she would balance that out with other comments that would soften the barb,
or would move on to a different topic, and always leave on a positive note.
This time, she found him in his clubroom with a
girl, and every word toward Nitanda was accusing him of being pervy or socially obtuse or generally weird and that Yukide shouldn't hang around him.
And that's while she's been made aware of how socially anxious he is. She didn't let him try and explain himself, and simply talked him
down in front of Yukide before dragging her away and leaving Nitanda alone. No parting goodbye, no "balancing remark" to offset the negativity behind her words.
It was markedly different to how she behaved every other time. Charitably, it's because she was jealous of Nitanda hanging out with a girl different than her. But she still went out of her way to make every comment of hers toward and about him, negative.
That's not banter, at least compared to every interaction they had before.
Beyond that - not everyone reads a given situation the same. And not everyone will agree that trash talk, insults, or accusing someone in a clearly-accidental situation a pervert, is benign and simply something healthy between friends.
You're welcome to think so, but you're not better than anyone else because you're less sensitive to such things and how they can leave lasting effects on those subjected to them.