You feel a bit guilty about it because you feel you were a bit uncharitable. This isn’t a mortal sin though - you were describing someone’s acts truthfully and giving your opinion in vernacular language about how those acts make that person appear, so you weren’t telling lies or bearing false witness.
Seems like a mild venial sin to me, nothing to get too worried about, but practise “custody of your tongue” so that you will refrain from saying nasty things about people. Remember the old saying: ‘if you can’t say something nice, then don’t say anything at all’ - particularly if there’s nothing to be gained by it. Of course if someone’s actions are bothering you and making you feel bad, even if you’re not directly affected, you’re within your rights to talk to someone about it. You just need to do so charitably.
So, on the assumption that you were of a suitable disposition to receive Communion before you spoke, I see no reason to suggest you aren’t still in such a position, all other things remaining equal.
By all means include it in your next Confession if you feel you will benefit, but don’t feel compelled.