Why do you care what they think? If they persist in thier narrow minded view then that is their cross to bear not yours.

Unfortunately the sex is what most see and unless you are part of the scene you are not aware of the rest of it. There are even many in the scene who do not see BDSM as being about sex at all. However, unfortunately, the hook - the thing that dragged most of us into this site - is the sex. To my mind it is like taking an advert at face value and thinking that someone who buys a particular cereal spends every morning dancing with cartoon animals.

Personally, if you have tried to change their mind and failed then I would just let them get on with it and never mind what they think or say. You know the truth and what they think does not apply to you.