There are three ways to get your feedback back to neutral:

• Have a counter rating put on your account.
  A counter rating will be a positive trust rating from another DT member that trusts you. This will counter the negative and should (I think) revert your feedback to 0. This probably isn't the best though, as the negative would still be there.
• Ask the user to remove it.
  No one else removes trust ratings other than the person that put them there originally.
• Have the person that included the user in the DT network remove them.
  In this case, it would be Blazed. If you can persuade them (or two other DT1 members) to remove/exclude the user from the DT network. This will automatically remove your feedback from being seen by default.

Other than that, there is little you can do. Sorry.