Medium has given us all a magic wand for dealing with these types. When trolls respond to your posts, and even your responses on other people’s posts, go to your post (not their response) and look for a link in the top right where the responses begin that says “manage responses.” Click the three dots next to the offensive post. Click “hide this response.” Poof it’s gone! The response stays on the offenders “stories” page for them to see, but NO ONE ELSE will see that response ever. You should let them know you have this magic power and from now on you are simply going hide all their responses, so resistance is futile. Then really do it. They’ll give up soon enough.