King David sent his men to comfort Hanun, King of Ammon, in the passing of his father. 

In response Hanun ridiculed the servants, made a mockery of them and sent them home.

This wasn’t a reflection of the servants or of King David but a showing of the disrespect from the King of Ammon.

People may not gladly receive what you do for your Lord-don’t take it personal. Keep spreading love, comfort and joy. You’re responsible only for what you do, not how others react.