watch out what you said

I found that's very very bad in my real feeling. We discussed about the note on the wall wrote by Mistugu. But, initially we don't know who has wrote it down and sticked on the wall. We supposed definitely that must be done by Niman. I feel not good and dirty of my mind.
我先入為主的認為奈男很討厭所以這種討人厭的事情一定是他做的，結果是日男，很窩齪的自己，討厭這種論人長短的自己，決定不再說人長短(不理他們)。