When I was bothered by something in a group I was attending, I spoke to the T about it. Group shouldn't be so triggering and judgemental that it makes you constantly uncomfortable to return. That said, I know I sometimes interpret anger and judgement where there is none, so getting a reality check from the group T helped me a lot...
If that is not a possibility, or not something you feel comfortable doing, can you address it in group maybe? There's also stopdog's suggestion of taking a break for a while or quitting all together.