Articulate?

I just reread the original post.

Being articulate has some importance because the world runs on communication. There's a limit to what can be achieved by one person, so teams are needed, which means they need to talk. At higher levels deals are done between people. You might buy a phone online, but businesses don't do multi-million deals like this. Also companies don't sign things, people do.

So communication counts. But plenty of people are not as competent as they appear.  Also, like with anything, words can have specific meanings. So different areas have their own vocabulary. To do medicine you need to know the right words, same for finance, computing, etc.

If you don't have the right vocabulary people don't listen, even if you are right.

But this just gets you a chance to show what you can do, you also have to able. A doctor that sounds good won't last very long if they are always wrong, same for a salesperson, or senior manager, no matter how well the speak. They can sound good for only so long before results count.

Being very able can work even if you are not a great communicator, but you need to be technically good or a great artist it musician, or similar.

Attitude normally means you are either unhelpful/uncooperative or too assertive. This can be a defensive position, consciously or unconsciously. If you are tired most people are also more snappy or in a bad mood. Which has the same effect. If disregulated you can be more sensitive to criticism, less able to negotiate or be flexible, and argumentative.

HSP applies to about 1 in 6 to 1 in 5 people. It is not a disorder. It should be possible find other similar people as it is not that rate. I am not sure how you tell though.

HSP are not constrained by routines and understand social interactions and social rules intuitively. Some interactions may cause over stimulation. So mixing should be possible without too much trouble in calm environments.

HSP is different to autism, even if some similarities exist, but the underlying mechanism differs.

I am curious to know where our attitude comes from.

I don't have all the answers. I can only say what I have observed.

I think it depends on the scenario.

1. Being detailed focussed, because  that is how some build bottom-up understanding of the world, can lead to being seen as pedantic. Either sticking on small ponts that don't change the big picture, or asking questions about implicit assumptions or arguing about them.
2. Social niceties are not always understood. So comments can be blunt or a bit inappropriate.
3. Nuance can be missed. So literal interpretation or misinterpretation is possible. Then wording can be clumsy or insensitive.
4. If lots of time has been spent on something (special interest) and a data dump is underway, it can upset, particularly if the subject is changed leading to grumpy behaviour.
5. Sleep is often an issue. Everyone is spiky when tired.
6. Dysregulation, due to overload (sensory issues) makes it hard to think clearly, since the pre-frontal cortex is de-prioritised. So you become more negative, less accommodating of different views or changes, more sensitive to criticism and tend to view things as a threat. This is all defensive.
7. Same if you are stressed by something, like if you have an appointment then next day you are worrying about 
8. If burnout is near you have the same issues as 6.
9. Some have difficult histories, giving overall issues with calmness. Can also cause overly defensive position due to previous experiences.
10. Poor diet or dehydration doesn't help either.
11. Unpredictable responses due to spiky profile can confuse people. E.g. you are good at one thing then stuck on something simple.
12. Novelty can be intimidating or scary. If you are masking it doesn't work if you don't know what to expect. Mental load goes up cause communication issues.
13. Differences I thinking mean conclusions obvious to you may not be obvious to others and vice versa.
14. Moods. People still have moods. 

There are probably more, but these are probably the main reasons why others might perceive an attitude.

One of the key definitions of Autism is having communication isses.

I can't understand what your point or question is. I don't know what you are looking for.

The original topic was whether a hsp person who was articulate but with social issues and attitude could be considered autistic.

Being articulate is not diagnostic. HSP is different to autism.

Could autistic people be considered to have attitudes different to anyone else, I gave so e reasons, obviously does not apply to all or in all scenarios.

If you are interested in psychological profiles and the big 5 traits then some books or lectures on the internet about psychology would be better. But these ate framed from an NT emotional and not systems perspective.

I can't understand what your point or question is. I don't know what you are looking for.

The original topic was whether a hsp person who was articulate but with social issues and attitude could be considered autistic.

Being articulate is not diagnostic. HSP is different to autism.

Could autistic people be considered to have attitudes different to anyone else, I gave so e reasons, obviously does not apply to all or in all scenarios.

If you are interested in psychological profiles and the big 5 traits then some books or lectures on the internet about psychology would be better. But these ate framed from an NT emotional and not systems perspective.