Besides, neutral trust isn't as bad as it sounds because people have done good things and received neutral trust for it, so for now you shouldn't be bothered about it unless its negative trust you got, otherwise welcome to the neutral trust club 
That would depend on the neutral feedback he got.We've here a campaign manager that raised an anti-AI campaign which is impossible for him to be accepted.
Sometimes I think this way that somehow people deserve a second chance, how about a public apology and creating a thread on the reputation board that he will change his attitude and never use this AI tool? And try to convince the one who left a neutral tag to remove it once he proven it. (of course, it needs a certain time to prove it).