Dont want to go back to Group Thearpy help

Default Dont want to go back to DBT group.
So I've been doing the DBT group therapy for a while a now. I'm nearly finished just one more month.
But I noticed myself well it feels Im going backwards.

What happened was our group had 3 weeks off because of Christmas and the hoildays. When I came back we had a fairly new member in our DBT group I mean they join mid last year but disappeared at one point and then came back. But this person will NOT cover up there marks let's say. In the DBT rules its required to cover up. This person will not do it. Then I saw another client in our group who didnt covered up either. It just brought back all those feelings because I use to do that but I haven't for months. So it was a real triggered for me.
Last week one of the clients who refuse to cover up got upset because they heard people talking in the other room. So one of the therapist told them to move position were we sat round the table and the other therapist went and told the people who were having there own therapy to be quite in other room. Then the other therapist said we have a break because the other client was stressed. In the past when we had different therapist if some one was upset or even cry we just ignored them and carry on with the session. I never felt it was right to ignore them but I knew if we did do some thing then group therapy wont be doing the lessons we need to learn in the group sessions.
When we had the break the one client who was upset about hearing the people in the other room and refuse to cover up there marks was going on about how they get alert in exam month. I thought to be kind and try to vaildate the person because when they mentioned they get alert during exam month. It reminded me when I was alert for months with this therapist I had for 2 years and how it utterly exhausted me and I got sick because well the therapy wasnt working and made me whole lot worse.
Anyway I said to them "It must've been exhausting for you "? And there response was quite aggressive but in a mild tone and said "Of course,of course " and I felt this huge sense of shame because I thought I did some thing wrong and felt told off. There response reminded me how my sister reacts to me quite aggressively some times
. Then later on in our group session the therapist was explaining emotional mind and logical mind using supermarket as an example. They say logical mind at supermarket would be the food you need like fish, chicken vegtables how much you need and emotional mind is and I said just being my happy self "chocolate" and then that same person said "well obviously". I just felt a sense of shame as if I did some thing wrong and I'm dumb.
Well after that group session well for 2 weeks I feel I'm getting worse. I'm crying more often like I cried 4 times and with reasons of being extremely sensitive what people say to me. I been having say self destructive thoughts. Also feeling happy of the thought to do it.
I really dont want to go back to DBT group. I'm scared because I dont know how that person is going to react. And it seems to disrupt the sessions. Also I dont want those self destructive thoughts to come back again and go down hill again.
If I tell my therapist they probably encourage me to go even though that group therapy making me worse. I dont know what to do. I thought just to avoid going all together.
Also is it normal what I have described to happen in a DBT group?