Super red trust feedback and I doubt that signature campaign accept this account or not
Yes you are correct if it SHOWS red on your profile, it will not be accepted, if you have one untrusted neg feedback it won't really matter but sig campaigns don't want to be associated with red profiles.
What are you talking about? Generally speaking most campaigns are not going to discriminate against how much negative trust you have. If you have overall red trust then you are going to be treated the same no matter what.
The OP has negative trust from three different people on default trust so I think it is safe to say he is going to have trouble getting into a campaign, and if he can get in then he will get paid significantly less then people with neutral trust.