The red tag or negative trust rating was given by Nutildah and tells that your alleged cheating or abuse of a bounty campaign, the explanation of how you cheated the bounty campaign here: https://bitcointalk.org/index.php?topic=5335270.msg62893679#msg62893679 (link also used to be the reference of negative trust rating). You can go to that thread (link) to explain your side since Nutildah didn't reply in this thread it won't notify to Nutildah, also ensure that everyone can understand what you are saying as I've noticed that some of your replies are hard to understand.