Instead of descending to their level, how about you take yourself out of the bad situation? This sort of grievance morality is just, "An eye for an eye, making the whole world blind."
When your focus is on removing yourself, you will eventually run from everywhere having limited options where to go. Also leave all the bullies targeting even weaker people. Or just become enabler, because not enabling became something bad.
Ghosting is running. Not only is it running, but it's degrading our collective life and common courtesy.