What other people think about you is none of your business. No matter what you do, or don't do, no matter if you are rich, poor, unemployed, employed, popular, unpopular, etc.....people are going to think what they want to think.
Why waste your time caring what these people think, you only have to answer to yourself in life, and that can be hard enough as it is.
Besides, anyone who has to resort to insults or bullying or judgmental thoughts can't be that secure to begin with. If these people were truly at peace with themselves, they wouldn't be giving you or anyone else any sort of condescending thoughts.
A simple thing to remember is: You are not what you do, you are not what you own, and you are not what others think of you. Don't give these people free rent in your head. If anything, use the whole situation as a filtering mechanism. People who treat you like that aren't people you want to deal with in the first place. Ignore them, or silently send them a blessing that they will evolve into something resembling a human being.