I am being complimented on my weight loss.
That's great news. How did you lose weight?
I have been working out for two hours every day at the gym.
Congratulations.  You should be proud of your weight loss accomplishments!
It's interesting, I hate it. I was a milk shake guzzling fatty who thought I looked good.
While I am proud of you for losing weight, it is never nice for you to insult others, specially after they just complimented you with your weight loss. I hope you find it in your heart to be more thankful and less insulting with others as it is a requirement for our society to have a functioning and collaborative relationship with one another.