Thank you, I'm aware of the issues autistic people face. I'm one myself. Most neurotypical people would probably consider my social communication skills to be poor and I wouldn't disagree. That does not automatically make me rude, arsey or arrogant. In every other respect, my communication skills are just fine and allow me to do complex, highly responsible things, such as driving trains.
The people described in your original post were behaving in a rude, arrogant manner. That does not automatically make them autistic. Plenty of neurotypical people behave that way. Navigating a world set up for neurotypical people is difficult enough for us as it is, without being negatively stereotyped in this way. As you have "experience" of dealing with autistic people, you will also know how true that is. The people you describe may be autistic or may be neurotypical but it would take even a highly qualified medical professional rather longer than one short observation on a railway station to make a diagnosis with any degree of certainly.
I would suggest that your original question might be better phrased as, "So what I don't get is why some spotters think that i) they know it all and ii) they are superior to others (workers, users, etc). Is this a function of being human?" The answer to that question for some people, whatever their neurological background, would be, "Yes".