I'm generally very laid back and understanding - I'd rather just analyse something than get riled up about it in most cases - but with some things I can get very angry. And I sometimes lose my temper with people if they're being very frustrating and argumentative, if they catch me on a bad day. So yeah, aspies can be angry and argue. You're probably just blessed with a rational outlook and a relaxed nature.
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shadexiii says, 'Don't drink the kool-aid.'