Haters gonna hate, u can post the forum/ign of the person who gave u offers (if they agree with it ofcourse). It wont guarantee 100% no more haters, but atleast its gonna be more convincing if the offerers r legit players.
Or u can simply ignore everyone and just make a new thread again and again, your item, your price.
Edit: if someone is deliberately being rude in your threads, u can always report their forum accounts, seen it work many times^^
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