There is not method that allows you to delete the Tag only from the content item. When the content item is saved we the ContentTagEditor throws an event where populates a list of ITags - if the list is empty there is no tag associated with the content item and this is why the Tag is not deleted when you are working with the backend.
Below is a sample code
// tagsControl is ContentTagEditor control
IContentTagEditor tgs = tagsControl
// subscribe for ChangedEventHandler.
// cnt is an IContent object
tgs.ContentId = cnt.ID;
sender, ContentTagEditor.TagEditorChangedEventArgs e)
.SelectedTags = e.selectedTags;
obj = ViewState[
] = value;
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