First off, sorry to hear that you had a run in with the staff of this site... I can appreciate that some limitations have to be put in place for the safety of the broad member base... as well as maintaining a good reputation as a support forum.
It must be difficult to be rebuffed when you're trying to help... but it is a sensitive area and in most cases such resources and tips are better off coming from a reputable site.
I know in the UK there are online resources (from governmental sites) on tried and tested methods of cutting for example that will minimise damage as well as tips on sterilisation and self-aftercare.
You are a part of this community though and as such it would be a shame to see you go on the basis of injured pride. By that same context I know from my own experience with other forums... that staff can mean well and are following the rules of the board, but the appearance of enforcing a rule or guideline is seen as undiplomatic or unfair... when all they are doing is their job.
Why not just take a day out and let things settle in your mood... it probably will help
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Independent Mental Health Advocate (IMHA): UK