First, silence is the best response. In real life, there are indeed some people who are keen on other people's privacy all day, and even for personal purposes, they are not allowed to speak ill of others behind their backs and spread some false news. The purpose is to suppress others, improve themselves and achieve their ulterior motives. In this case, if you don't fight back, it's exactly what he wants. He wants you to fight back. The more you fight back on this matter, the more people you know, the bigger the fuss, and the worse for yourself.
Second, let the rumors die. There is a saying: you can't really fake it, and you can't really fake it. When others talk about you behind your back, you don't need to argue or confront each other. Just like two people quarreling, only one person can never quarrel. If both people quarrel, the quarrel will be even worse. The same is true of people who lie behind their backs. If you ignore him, he will get bored and won't mention it again. So rumors have no market.
Third, people should be self-disciplined. Do the right thing and go all the way. If you are honest and open, you will get along with others on the principle of being kind to others, no one will speak ill of you behind your back. Even if you want to cheat you and hurt you, others won't believe what he says. Stand up straight, no matter how strong the wind is.
In our work and life, we should treat others with a kind heart, pay more attention to our work, ignore those miscellaneous things, and maintain a normal heart and a stable state of mind.