Sometimes people have nothing on you so they act your image because they can't win or get their way. All you could do is ignore them the more they talk they'll dig their grave and get caught up. It's easier to walk away they'll try to tarnish your image but it's a reflection of theirs that they are projecting on you.
Seeing them mistreat others it was only a matter of time till they fling their bad vibes your way. Not wasting time or energy on them focused on work and better skills with practice. Using energy in a positive way instead of lowering yourself to be liked seeking approval of others. Their views have no say or control on how you live your life so make the most of things.