Violations of trust, especially from people who "bite the hand that feeds them" or at least bite the hand that tries to 'feed' them. It's infuriating when you open yourself up to a person and they just use that freely-given information to exploit and/or belittle you later on down the line.
I can forgive a lot, and I make a conscious effort to try and not hold any secret grudges... but that doesn't mean I can still afford perceived offenders the same amount of respect or trust as I did beforehand. I can continue being cordial with a person that's 'wronged' me in the past (for the sake of practicality or simply 'keeping the peace') but the disdain I have for them will still be unarguably public... at least for anyone with an ounce of observation in them. Even when my words try to mask it, my face just says it all.
It's classic passive-aggressive behavior basically. For better or worse.
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An interesting thing in all this: the behavior we hate the most in others oftentimes reveals the behavior we hate the most in ourselves. By some accounts I'm sure I could be accused of being an 'exploiter' myself. In fact, I can think of several *recent* occasions on BBS's and IRL where I misused trusted information in some misguided attempts at besmirching or belittling others. Now how tragic/comic // enlightening is that? The things we hate the most in our fellow man... those are the things we need to guard against the most ourselves...
What a wake-up call. What a mindfuck.