We do have a topic specifically for non-triggering discussion of SI issues. It's here: http://www.scarleteen.com/forum/Forum9/HTML/000361.html
If you were reading one of the main SI topics, those are generally intended to be a safe forum for people to talk about their experiences -- and much of what they write about there will be triggering. Generally, people who are easily triggered try to avoid reading those topics.
If the incident you're describing happened somewhere else in the Support Group forum, please post a link and one of the mods in that forum will take a look at it and decide what should be done.
Do not meddle in the affairs of dragons, for you are crunchy and go well with ketchup.