How should I report a priest for promoting sin?

Last summer I was traveling and I stopped for mass in another state. Throughout mass I was rather uncomfortable due the celebrant's demeanor/conduct, but I brushed it off as "just a bad case of progressivism." After mass I asked him to hear my confession, so we went to the confessional and began the standard process. Without disclosing the exact sins that were confessed, I will clarify a few things: 1. Every sin I confessed has been officially recognized as sin by the Catholic church since her beginning (and before that, by Judaism). 2. Some sins caused direct injury (without being specific, either spiritual, emotional, or physical) to another person. 3. I have confirmed with numerous other clergy that the things confessed were indeed sinful. Throughout my confession, the priest interrupted me many times to say, "so what?" or, "that's not a sin." I expressed the desire to help those affected by my sins come to healing, and the advice was, "Tell them to get over it!" *I spent more time arguing that my sins are indeed sins than I did giving my confession*. In complete honesty, it felt like I was speaking to an atheist clown at a circus and he was mocking me for my moral consciousness. I know with certainty the priest was wrong in this scenario, and I am afraid that he will lead others astray from salvation and into sin. However, I do not know how to make sure the matter is addressed appropriately and sufficiently resolved. I believe the best course of action is to report this to the diocese, but at the same time I am afraid that my experience was just a symptom of the diocese's own potential corruption (specifically, the administration). Also, I do not know *how* to submit such a report. How should I go about resolving this?