Don’t Retweet people that talk smack to you.
First off, they more than likely have no followers so pretty much no one sees what they are saying to you.
2nd, chances are they started the tweet with an @ sign. this means unless all of their followers already follow you, none of them will see the smack talk unless they go specifically look at the perpetrator’s timeline.
3rd, if you retweet them, you possibly give them followers by showing them off to all of your followers. Their thought process “all I have to do is talk bad to this person with thousands of followers till they RT it, and I will gain followers because they think its funny? done!”
Do one of two things… Ignore them cause they’re not worth your time. And/Or Block them and call it a day.