A kid with an ASD may, for example, sit too close to you on a public bench, completely unaware that she is giving you a case of the cooties. He may feel hurt and surprised when you change the topic of conversation because he did not pick up on your subtle non-verbal cues that said, "Yeah, I am really done talking about Star Wars now." Maybe he doesn't always know or understand why it's perhaps inappropriate to hug and kiss you on your lovely luscious lips the very first time he meets you. Stuff like that.
And sometimes he may find it hard to see sense in the fact that only girls should be able to wear bedazzling pink clothing and accessories (when you think about it, this one really doesn't make any sense, does it?).