Why do people say that you are complaining and have a lot of negative energy as soon as they say what happened to you, instead of understanding and tolerating you?

Because it is impossible for others to put themselves in your shoes, maybe he is right and you are complaining, maybe he doesn't understand your situation at all, and he doesn't look at the problem from your point of view. I didn't know the pain until the board hit myself. So try not to tell others what happened to you in the future. It doesn't make sense and it can't solve the problem. Only talk about happy things.