“As for the ignorant blind follower, then do not pay attention to him.
Do not allow his insults to offend you, nor his takfeer, nor his declaring of you to be misguided.
Certainly, it is like the barking of a dog;

So do not make the dog important by responding to it every time it barks at you.
Leave it in delight with its barking.”
– Ibn al-Qayyim in al-Sawaa’iq al-Mursalah (3/1158)