Why people behave like this?

I don’t understand what is wrong with every one? Or is something wrong with me. Why I face such things in spite of helping everyone. Why everyone take advantage of people who co-operate with them and help them?
I am a person, who doesn’t get angry easily, and it takes something really huge a reason to make me angry but I do get offended and I feel bad when I feel I am wronged. But in the first place why should I be wronged? What have I done to get this?
The last day when I told someone to do a certain thing she replied that it cant be done. But I had advised from my experience. Then people charged me as to why I am telling them something like that. I had just tried to help their hard work. We had made a similar thing last week and we faced the same problem that’s why we had to take that certain step, I was referring to. Was my advice wrong, I don’t think so? But I dint understand why they spoke to me like that.
How one feels when someone constantly bugs you and commands you. I don’t think if anyone will like that idea. But it keeps going on. But why I don’t give it back to people. I should but I don’t like fighting. But I can’t take any misbehaviour, that’s one area where I don spare my family members then how can I take it from just another person.
And its not just me, I know two other people who get the same stuff as they don’t want to fight. I feel bad for them. But enough is enough, I think its time to give something back to people. But again I feel that will be a wrong deed from my side. But what can I do ?
I respect each and every person unless they do something really bad. And lately I am losing that respect for so many people. But thankfully the person whom I respect the most has not done anything for which I’ll lose respect for him. I dread the day if such a thing happens. He is one person who doesn’t take undue advantage from me, or anybody else. He is a person whom I can trust anytime and I know he can never go wrong. They don’t make such stable and respectable persons in bulk, I know. I wish He could make people like him. But then again he would be like just another person. Its good I have a person with me with rare combinations.