What does this mean?

What does this mean?
Originally uploaded by bilhelm96

I saw this sign at a country/western bar/restaurant near my office. I find it hilarous and frustrating at the same time. What does "management" base its discretion on? Will I get kicked out if I don't wear cowboy boots and a hat? What if I wear colors that aren't in style? If you want the ability to throw people out for any reason, just put up a sign that says, "We can throw you out for any reason we want." Don't hide behind some unclear random dress code "policy."