I learned about Bitcointalk auction standard regarding vendor bids in that auction. Back then, ~3 years ago, I did not know that vendor bids are not cool here. The bitcointalk auction standard is vague and not even described anywhere. I've held countless auctions since, with no complaints. Now two DT'ers are stepping in to rate me for that vendor bid (at least publicly they state that as the reason). Do you see that as reasonable and justified? "Warning! Trade with extreme caution!"
Your trust rating has not so much to do with your self-bidding but rather with you being stubbornly defiant about it. Any reasonable person would have said "shit, I didn't realize that, sorry" and moved on whereas you're never wrong. This speaks to your poor ability to handle disputes or even minor disagreements. You're lucky to get away with two red trusts (so far).
This narrative that I did not do this "shit, didn't realize that" is misleading. Go look up how it went and stop believing in third hand stories. I am not defiant about it, why would I be. Aren't my actions speaking louder? I've not done a vendor bid since that auction! So stop spreading that bullshit narrative, it has nothing to do with reality.