Question

He that loves to be flattered is worthy of the flatterer meaning

Answer 1

It has a very simple meaning.

A flatterer is a person who praises false and in an insincere way to get their work done. 

If somebody loves people to praise him or her falsely to please him or her then that kind of people deserve flatterers because the job of the flatterers is to praise falsely to please to get their work done. 

( jinhe chaplusi pasand hai wo chapluso ke hi yogya hain)