Late 20's, parents keep offering to pay for conversion therapy.

Gay male, late 20's, been out since college. Parents keep offering to pay for conversion therapy. I've done it once already and I had a horrible experience with it. I just kind of laugh about it every time they offer, but I'm getting tired of it and want to put to bed once and for all.I was in a really dysfunctional relationship for many years and my parents keep using that as an example of how terrible being gay is and how I could change that by going to conversion therapy. I'd rather not cut them off but it's getting to that point.