This t-shirt, available for sale on Threadless sums up the irony perfectly.

The copy promoting the t-shirt is pretty good as well.
"Is this type tee a badge of honor highlighting the wearer's unique tastes in off-the-beaten-path music and other such awesomeness ignored by mainstream culture, an ironic indictment of others who condemn you for listening to a band once they sell fifty copies of their first album, or just about having imaginary marching bands cascading through your head at all times of the night and day? YES!"
Posted by Ed Cotton
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