You're being irrational!
As anyone who has watched the original Star Trek series knows, Mr Spock was big on logic. He was also big on labeling the behaviour of humans "illogical". For example, consider this quote: May I say that I have not enjoyed serving under Humans. I find their illogic and foolish emotions a constant irritant. Season 3, episode 7 ("Day of the Dove") Now it's true that humans do make logical errors from time to time. For example suppose Tom is considering hiring a contractor. A friend recommends asking for references because "Good contractors provide references." Sure enough, the contractor provides references and Tom hires them. Unfortunately the work is poor, and Tom complains, "I thought good contractors provide references!?" But it's not just in the case of formal errors of logic that people's arguments and behaviour are termed "illogical"—or more commonly "irrational". For example, purchasing and selling decisions ...