Jump to conclusions about people. There’s nothing more shortsighted than failure to afford someone the courtesy of telling his/her own story. People who exhibit this specific form of prejudice make it difficult for me to believe that their intellect is tempered with wisdom.
Be a meanie. Whether you’re doing it to me, other humans, or our environment, unkindness is a really, really unattractive trait. A coldhearted spirit drains the life out of me faster than the crystalline entity, and I prefer not to spend too much time around such toxic forces.
Be shallow. It is nearly impossible for me to look up to anyone who can’t relate the most time-consuming things in their life right now to a larger plan for making the world a better place.
Be conceited. This can be expressed in many different ways, ranging from subtle but intentional neglect, to overt refusal to make small concessions for the sake of a relationship. In any form, this incarnation of pride is really hard for me (and, I suspect, for those who exhibit it) to see beyond.
Be sneaky. I really don’t mind secrets, because they can easily be lumped into the infinite expanse of everything else I don’t know. Heck, I can even tolerate occasional dishonesty, because it can often be handled with the allowances I already make for normal mistakes in communication or interpretation. But, I can’t think of anything more disrespectful to me than an intentional effort to adjust my thoughts, emotions, or actions without my knowledge or consent. I’m a naturally trusting person, but manipulative folks will find that trust incredibly difficult to regain.