stuff

Lying...
I can't stand someone who lies to anyone.

Cheating...
I can't stand someone who takes advantage of people.

Self-Centered...
I can't stand someone whose main topic of conversation is themselves.

Denial...
I can't stand someone who is unable to accept blame or see fault in their own actions.

Intolerance...
While I understand that religious conviction is a positive trait, I can't stand someone who is self-righteous and feels that their particular faith is the only one that matters.

Racist...
I can't stand someone who believes that any particular ethnic group to which they belong is superior to the rest of humanity.

Gossip...
I can't stand someone who loves to talk about other people - especially behind their backs.

Undependable...
I can't stand someone who fails to come through and is unreliable.

Recklessness...
I can't stand someone who has a careless and irresponsible manner when with others.

Infidelity...
I can't stand someone who engages in sex outside of marriage

Drugs
I can't stand someone who destroys there own body or runs away from problems through substance abuse