Newbies: The trust system isn't moderated! If someone leaves you negative trust, deal with it - it's not getting removed. You can leave trust back, and if that person is in the default trust list, you can ask for them to be removed, but otherwise, just PM the person and ask civilly.
This should prevent posts/PMs like this:
Why would you leave me a negative trade rep?
If you dont remove it Im leaving one for you as well, which will also mess up your profile and will report you to mods for Mis-using the system, we havent traded before!