NotEqual operant is not supported by FilterExpression property. You need to create a custom list or override NewsView control if you want to get all items that do not belong to this Tag. Here is a sample code
var Manager =
IList TaggedItems = Manager.GetContent(0, 0,
var allItems = Manager.GetContent();
var queriable = allItems.Cast<IContent>().AsQueryable();
var result =
var id = c.ID;
result = queriable.Distinct().Where(cnt => cnt.ID != id).ToList();
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the Telerik team
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