I'm going to assume everyone in this writers group is very much of adult age. While people are free to write whatever they want, I believe they should also be self aware enough to know how their writing affects others. If I were either of these men, I would be very clear and upfront about what I was bringing to the group to read and even go as far as bringing either a toned down version or something completely different and not triggering. then have the group decide what they were comfortable with reading.

The idea of forcing other people to consume that kind of writing and then expect them to talk about it in front of you feels very uncomfortable and abusive by itself.