So if a red trust rating is not the same like marking a scammer
Where did this come from? I haven't said it's not the same. If you ask me it's almost the same. A red trust rating is a scammer tag or an indication that an user had a scammy behavior which indicates it's very likely he will (or tried to) scam.would you be fine if someone makes your trust red because he "thinks" you are a scammer? You know... you would not be able to defend yourself, because the evidences are only the believe of someone. So what would you say then?
Sure that would be fine as long as I've had a scammy behavior or I'm trying to scam, even if I haven't really scammed. If that was produced for a misunderstanding I would PM him or create a thread on Meta. Since I have never had a scammy behavior I would be certain that negative trust wouldn't last.This is not entirely true. You don't have to have any "scammy behavior", all you really have to do is get on the bad side someone on negative trust. It's pretty easy if you tend to call people out who are in the blessed class.
If I received a negative rating without even having a scammy behavior or other good reason then of course I wouldn't be OK with that. However that's very unlikely to happen and if it's clear I would contact the person who added that person into the default list (i.e. the user of depth 1) and ask him to remove him.
What do you mean "get on the bad side"? If you have problems with other people and "tend to call people out" then definitely you have more chances of people calling you out too. But if you never had a shady behavior it would be very difficult for them to do so (unless they're just plain lying but in that case it shouldn't be difficult to have them removed from the default trust list).