it's easy to catch a resentment. it's harder to realize WHY you're catching it - what your part in the resentment is.
what i know about myself is that when i get resentful of someone or something, it's usually because that someone/something hits a little too close to home for me. there are very few things that bother me unless i recognize them as behavior i used to participate it. for example: there's a girl in the rooms here who shares for at least 10 minutes about her experience, etc. every time she gets the chance. i resent that fully, but i resent it mostly because i can see myself doing that, or i am afraid that i come across that way to others.
that might not be the case here. at any rate, i would encourage you to talk with someone close with you (sponsor, friend) about what's going on and maybe inventory it. resentments are the number 1 offender, y'know?