John, proof has never been required on a BOI post, but it would be nice to have details.
My curiosity got the best of me and I did a little reading. In August, Sheila made a post about a mali she'd ordered that was to be her first reptile. You can read that one
here . It turns out that it was a sick, wild caught animal. Since that time, if you look at Sheila's posts, she's been buying/selling/trading pretty regularly. In my opinion, this is someone who got bitten by the reptile bug, but doesn't have alot of experience with the hobby or know exactly what to look for. That's not a condemnation, just a possible explanation. If someone goes into things without much knowledge, disappointment is pretty likely.
As far as her opinion of Ben, she may have a valid gripe (like I said, a great reputation does not make someone immune from being rude), or she just may not understand that sellers may not always have unlimited time to gather information for a buyer. (Or maybe the shipping cost was already discussed or disclosed in the ad?)
Sheila, my opinion on this situation is this: "bad guys" lie, cheat, steal, scam. Posting a "WARNING!!!!" about Ben because he was, in your opinion, rude to you is highly overreactive. You may want to consider that not only is the reputation of the person in the subject line evaluated on BOI posts, but the character of the poster is exposed as well.