What is it about gold teeth that freaks people out?

The United States Army has banned grills.  Here is a quote from Animal Magazine who excerpted the Army new regulations:

The use of gold caps, platinum caps, or caps of any unnatural color or texture (permanent or removable) for purposes of dental ornamentation is prohibited. Teeth, whether natural, capped, or veneered, will not be decorated with designs, jewels, initials, or similar ornamentation.

via US Army To Ban Neck Tattoos, Cornrows And Grills – ANIMAL.

You understand that most grills are removable right?  What is it about gold teeth that makes people freak out?  My criticism is that they are wasteful and might damage your teeth or mouth.  But that might be true of sour patch kids, and I don’t think the Army should ban them.