It's best if you don't reply to him. They are provoking you to make mistakes. So that they can use that as an evidence to mute you or get you banned.
And, if he is rude in Private chat, take screenshots, report the said user for abuse (if you click the verbal abuse option, more subcategories pop up. You will see an option called "rudeness") , input evidences in the note. Report him. If you need more help, PM me. I will try to assist you as much as I can.
Interesting thread.