So here's a question. How do you respond to comments from people that obviously haven't read the story codes? Like, I got a comment in regards to some of the bdsm elements, but it's in the codes and in a disclaimer at the top of every chapter...
Sadly, not everyone reads story codes (especially those stories which list dozens, while others learned not to because of those same stories). Even if they do, most will forget what the codes were after they've been reading several weeks/months, so it may still come as a shock.
If you want to minimize it, remind readers, either in your blog or in the end-of-story announcements (which are more widely read than blog entries), or given hints that it's in the works (ex. certain characters might give hints they're interested in certain traits, or suggest their into certain 'kinky' sex acts before you reveal what they are). That way, readers will anticipate it, and it will give them plenty of time to consider it so they won't be so shocked later.
But, in the end the story is the story, and it'll either stand on its own or it won't. You can't apologize for it, and you certainly won't change it because of a random complaint. However, don't alienate long-term readers over it either. Acknowledge their displeasure, explain how you tried to warn readers, and as a last resort, offer suggestions for stories they may appreciate more.
As always, it's better having happy readers who dislike a single story, than lifelong foes who'll try to poison the well for others (i.e. treat them with respect, rather than disdain).