I think that when someone is mad at you and tells you are fat, is because they know it bothers you. I do think that is wrong. If you have been told this since you have been young then it would have an impact on your self esteem. i have had people comment on my weight. I have been skinny, and fat. People have always made some kind of comment about what I look like. Now when someone tells me something that shouldn't be said. I just tell them something I don't like about them. Try that once and see if they will shut-up. Usually they will keep it shut after that.