Just telling some one to stop isn't going to help them over come what they are dealing with
(I have gotten this line too) Its better to try to help some one recognize what they are feeling and help them work through the process of re-building self worth. (I am grateful my husband has been working through things with me in this way, it make all the difference) I personally had to make a point of taking time to recognized small "victories" if you will. I will look at stuff I am working on and immediately hate it...but then I stop myself and say ok so I don't like this but you know what the hair is pretty good, or the eyes don't look half bad. Its not easy but If I keep at it after a while I can look at what I'm working on and say well I guess its not so bad. (this isn't easy and it takes practice) So don't be upset with yourself if it doesn't work right away. I hope this can some how help you out just a little. If not come back and we can brainstorm some more lol