How should I deal with someone who says I have no talent or virtue?

When someone talks about you, it means that he cares about you. If he wants to suppress you, it means that you are worthy of his attack. Just imagine, if you were a good-for-nothing wretch, what would he say about you? You ignore them.

Actually, you can reconcile with them if possible. One more friend is better than one more enemy. No matter what they do. As the saying goes, it is better to offend a gentleman than a villain. And, you can see if they would still say that if you reconciled.