In this instance, Fanny's surgeon tried to pass the blame and told Fanny that because it's a fistula into his colon, a general surgeon should be the one to fix it even though the SRS surgeon was the one who caused it. Imagine you're a plumber and you get called in to fix another man's work. When you arrive, not only is what you need to fix completely incomprehensible, using methods and techniques completely alien to anyone besides the man who did it, the thing you were tasked with fixing is the house's electricity. Then when you say "just because they somehow wrapped live wire around a drainage pipe, that doesn't mean it's within my realm of expertise," the home owners blame you for not fixing it while the electrician who ruined it is in the same room and convincing them it's your fault. That's what's happening to fanny, his neovagina, and his general surgeon against his SRS surgeon according to Fanny's recollection of events.