Don’t recruit people into your grudges. Let them decide about someone for themselves.

Pulling other people into a dispute is a way of making yourself feel less alone in it. The cost is that you have taken away their chance to meet that person without a verdict already attached. It also turns a problem between two people into a small faction, which is much harder to end. Grudges with recruits rarely get resolved, because now there are reputations tied up in them.

Tell the person you have a problem with and nobody else, if you can manage it. When someone asks, you can say you two are not getting on and leave it there. Let your friends form their own opinion.