Everyone needs to be respectful towards others who’s opinion they disagree with. One of the problems of social media is the ease which people can insult others. It is possible that the person who calls your podcast negative really Believes that is the case. They can choose not to listen but there is no reason to insult them. You also don’t have to change as your podcast is an “opinion”. By the same token calling people who support the program a cult or a social club is disrespectful. Virtually all of those people will continue to help REGARDLESS of who the coach is.