It's tacky. Period. Never be "that guy." And yes, bands know "that guy" when they see him...or her.
To me, "that guy" is the guy or gal that thinks some unwritten rule should dictate what they wear.
Agreed!
Next show I go to... I'm wearing THAT t-shirt! You know... THAT one. I've only had it a month and already its got sentimental value to me...