What does 3 John 1:10 mean?

So if I come, I’ll call him out for what he’s doing—spreading nasty rumors about us. And if that wasn’t enough, he refuses to welcome the believers and even tries to stop others from helping them, kicking them out of the church if they do. 3 John 1:10 - Modern Text Bible

(John plans to confront Diotrephes for his slander, lack of hospitality, and for punishing those who help others, showing the seriousness of his actions.)