I don't think participating in or being a moderator of the gitlbtc forum is a big deal. Although I would not be surprised to see someone not in the DT network (and not having decent amounts of positive trust) receiving a negative rating for participating in or working for the girlbtc forum.

Your second issue I agree with more. There is no reason to leave a negative rating for how someone posts, as this has zero to do with their trustworthiness. Someone having bad posts is the responsibility of the forum administrators to handle not anyone else. I would not personally give any credence to anyone who leaves negative ratings for bad posts.