Well, I'm not gonna lie to you. There are cases and cases, I've only analyzed those present in this thread. I don't think that putting napkins on that thing was really offending or anything, at least from what you tell me. For example, ff you've done that with a guy you had no relations with, it could
come off as creepy or unpleasant. But you've said he was a friend, right? I don't really see the problem with it, other than it could be considered an odd quirk, but not one needing a teacher to interfere. And I don't know under what context that person told you that it was aspergers fault, so I can't tell you whether he's right or not.
Basically, what the other guy is saying, you ought to learn what is considered good to do and what isn't, and don't take media as a good example to follow because they're mostly scripted to make the story move, and not based on how real people would react to certain events.
Also, I still don't understand the banana analogy or what do you mean by "The focus is on your society engaging in weird behavior toward people with aspergers". I've read it a few times again to see what you're trying to imply but all I've got out of it is that "normal" people act weird in front of aspies to piss them off or something. This isn't common. I mean, you can't tell aspies from common people at a glance, unless they were doing something so odd it could raise a flag. And even then, why somebody would engage in these "weird behaviors" toward them? Unless you're a dick trying to ridiculize them, which brings us to first base again.