What to say to someone who constantly tries to upset you, pushes your buttons

They are clearly jealous of you and wish they had your life! So, that is why they are trying to bring you down a notch or two. These types of people will find something that they know will upset you or make you mad, or you are sensitive about. Then they will bring it up so that you get mad. Don't give them a reaction. In fact, you can act like they just gave you a compliment! Like you didn't understand that they just insulted you! The worst thing you can do is get upset. You are falling into their hands.