This is where DBT comes into play. One of the skills is to recognize your feelings, emotions, or warning signs that usually occur before behaviors. So when you are about to do something, think about the feeling or emotion you are having before you do the action. Is it impulsive? Once you start doing that it will become innate. When someone on the other forum or in real life bothers you for some reason, think of the emotion. Is it negative or positive? Angry, sad, happy, jealous, whatever. Stop, recognize the emotion. If it is negative and your impulse is an action that may cause someone to be mad at you or abuse you...THINK about it first. "Sit" with the emotion and feel it. What message is it sending you?. Are you going to regret it later (will result in guilt...another emotion)? Most of the time, the answer will be yes, you will regret it and feel guilty. You may not feel the guilt because you are not clearly thinking. You may be trained in your head that all you are used to is negative emotions or feelings. You don't want to experience happiness because it might be too overwhelming for you to feel.
Sometimes, when I feel like something someone is doing is unjust, I will have the impulse to say it even though it will come out as rude. But DBT taught me to recognize that I may be feeling jealousy that another person would do such things and I want to correct it. Instead of being impulsive and ruin the relationship, interpersonal effectiveness (DBT) will help you save the relationship while helping you get your point across to the person. You will get your needs met and you won't feel guilty later by realizing you ruined another relationship. And then there are the times that you just have to let things go. You can't change people. You can only change yourself.
I highly recommend DBT if you haven't tried it already. I hope I made sense. It's kind of hard to explain DBT and impulse control and self punishment.