What personality trait in people raises a red flag with you?

Never, ever lie to me
Or tell me an untruth
I catch you in a bare faced lie
And that’s the end for us.
You’ll some times
Coat the truth a bit
Or dress it up a bit
But deception is a different thing
The trait I hate the most.
If you’re not reliable
I can’t trust what you say
Then you’re not a friend to me
But someone to avoid.
Liar, liar pants on fire
Stranger to the truth
Cross, your fingers,
Hope to die
And do not tell me lies.