I've PMed you about the rating, and as for your brothers account and yours you both need to be sure to log out. You are responsible for what is posted with your account, I don't want either of you getting in trouble so remember your passwords and log out!
i THINK they wear off after a while, but i dont see you being able to delete them. you did something wrong in the trade. maybe you ran in their town? everyone hates that, it tramples the flowers or many other things. anyway, you must of did something wrong, you have to pay the price in a bad rating.
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for your other problem just log out. its next to settings in the bar with notifications and My profile.