Why doesn't the Westboro Baptist Church desescrate the flag of Vatican City?

Think about it. Many times, you see Fred Phelps, Shirley and that lot doing whatever you can think to the American flag (dance on it, wear it as a skirt, stomp on it, fly it upside down etc.) Why don't they do the same to the flag of Vatican City, giving their anti-Catholicism and their 'Priests Boys' campaign.