I think 'resentment' sounds like a serious word.
If we change it to 'a thing that peeves me off and gets to me, and once I start thinking about it I dwell on it' then it's easier to think about.
Some of my resentments were really old (one from age 8 in the playground!), and were not all 'serious' issues, but thinking about them would definitely affect my day. And yes, I had a few that would spark off a 'drinking AT them' reaction. Thankfully those resentments have lost their sting now (I can laugh at most of them) and my AV doesn't get the same chances to play it's 'drink at 'em' card.