There is no rule in life that says you have to be friends with every person you know or encounter. There are some mean people in this world who will always be dissatisfied by their own life and thus insult and hate on others constantly. Don’t get sucked into their drama and insults. Avoid them, change jobs if the situation is severe enough that it affecting your mental well being and attitude in life. Don’t allow this type of person to be disruptive to your life. You have control over your life and who you spend time with. Anyone who is continually hurling insults at you out of jealousy is not deserving of your time and energy. If it is a family member, you can limit your time and exposure to the person. If you feel like you need to be around them in order to spend time with the whole family, then avoid direct interactions or make contact as brief as possible. If do interact, remind yourself again that their comments are based on their own unhappiness in life and have nothing to do with you.
You cannot control the way they act, but you can control how you react to this person. Chose the higher ground, which is not reacting to their negativity. Although it will still not be pleasant, not giving them the satisfaction of seeing you upset can help you get over the situation more quickly and move on to more pleasant people and conversations. Don’t allow yourself to get cornered by a person you know is jealous of you, because the outcome will not be good. If you need to simply cut off the conversation and go somewhere else in order to avoid their comments, then do so, because you don’t need to allow yourself to be subject to anyone’s abuse.