Like I said he is especially in the wrong as to how he is acting after you gave him the negative trust. (I think he was also in the wrong after he made two or three posts in your gift card thread). Also correct me if I am wrong but all of those posts were made after he received negative trust from you.

If you really want this resolved then I would suggest that you remove your negative trust for 24 hours, and both post here and PM him that his negative trust will stay removed in the event that he either removes his posts or edits his posts so they more accurately reflect facts and give nothing more then constructive criticism. If he complies then you don't bother him again and he doesn't bother you again; if he does not then you can add your negative trust back on his profile; if he removes the posts and then you put the negative trust back on then he adds the posts back to your threads; if he deletes the posts then adds them later then you put the negative trust back on his profile.

You are both essentially trading with "paypal" so neither one of you risks anything by "going first". I understand that you trust rating means that you pretty much never need to "send first" when trading with others and as a result you have very little risk of ever getting scammed, however your risk in this situation really is very low.

I know this is unsolicited advice, and you can take it or not, but that is how I would handle this kind of situation if I were you.