missislaveblog:

I’ve been finding that a lot of people don’t understand how respect should be shown in a D/s style relationship. While it is important to show respect to the dominant when dealing with them, a lot of people overlook that how they deal with a dominants submissive is also extremely important.

An owned submisssive is the property of her Master. Therefore, how you treat/speak and address this submissive directly reflects onto their dominant. For example, if you address a submissive in a disrespectful manner outside of an agreed play session or the like, you are therefore being disrespectful to the owner of that submissive through your behaviour as well.