Ummm... for most Aspies, they are absolutely fanatical about certain rules. The problem is, it isn't always the rules WE want them to be fanatical about. It may be rules in their own head, things they have "figured out"... and when the world doesn't work that way, they don't get it. When they accept something as a "rule"... they hold to it like crazy glue.
Oh, and don't go breaking a rule once, just once, yourself... or the rule isn't a rule. No jaywalking... is a rule. But if you break the rule, then he can break the rule whenever he wants, because it's not really a rule. (really black and white thinking)