Negative critics from other people reflect how they feel inside. Of course, a resentful and envious person will naturally be more critical of others than a happy human being. Moreover, how we look on the outside cannot tell everything about our life. Whenever someone chooses to use our external aspect to criticize ourselves, it has nothing to do with us.
The more I grow, the more I learn to deal with negative people in that way. Additionally, I am always stunned to witness hate towards wealthy people. I learned that badmouthing rich people attracts even more poverty. Attracting abundance into our life requires to have respect towards and to be happy for people who succeed and are wealthy. Then, abundance can flow into our life as well.