You don't care what they think!
The story: You have saved for several months to finally buy that bag that you have been eying for years. Your colleagues start saying around that you are wealthy and that you don't need to work, since you can afford such an expensive bag.
Don't: You care about what people say about you in the office. It impacts you, as you know that deep inside it is not true. You try to explain them the story of your bag.
Do: You don't pay attention to what people say. You let them speak and don't even try to know what is told.