A preface: nothing in this post is the fault of Edmund J. Bourne, PhD, author of The Anxiety & Phobia Workbook (fifth edition). That book introduced us to the concept, but we are not psychologists and our interpretations are our own.
That said, we hate most of the posts we can find on the World Wide Web on the technique, so we're writing our own. Hit us up in the comments if you have thoughts on our presentation of it. Content warning for discussion of self-loathing, albeit in a healing way.
( Sometimes your brain comes up with reasons for you to hate yourself. The goal of positive counter statements is to refute those reasons. )