Following Tim Bridges’ excellent article on responding to criticism after preaching here is a free ebook concerning criticism in general from C. J. Mahaney:
Some great advice I was once given on responding to criticism was rarely to say anything immediately. Sometimes we will have the words to say and the heart to receive it rightly. Often we won’t. Therefore, the most helpful thing can be a “Thanks, I’ll think about it and get back to you.” If the criticism is valid I need time to reflect on its truth and respond appropriately. If it is not valid then my off-the-cuff response is rarely going to be wise or godly!