Who dares accuse those whom God has chosen for His own? No one! For God Himself has given them right standing with Himself.  So, who then will condemn you? No one! For Christ Jesus died for you and was raised to life for you, and He is sitting in the place of honor at God’s right hand, pleading for you! (See Romans 8:33-24)

That’s why God blesses you when you are mocked and persecuted and lied about because you are His follower!

Be happy about it! Be very glad! For a great reward awaits you in heaven. And remember, the ancient prophets were persecuted, too. (Matthew 5:11-12)

And to those who accuse you, the following Bible scripture applies to them:

You may think you can condemn me, but you are just as bad, and you have no excuse! When you say I am wicked and that I should be punished, you are condemning yourself, for you who judge others do these very same things.  And [...]