Signs themselves might not, but you've got to be a moron to open carry in a park etc where there are no-carrying signs, or in a gun store where they specifically say not to. I know many instances where even in gun stores open carrying might get you a quickfrom the shop clerk.
I don't know, I guess I just prefer not to be arrested or shot lol...
My comment was referring to the fact that a posted sign doesn't make it illegal (and therefore an arrestable offense). I wasn't addressing the wisdom of OC vs CC in a given location.
If it's private property, they can only ask you to leave, and failure to do so is trespassing. Having a gun on you at that point is irrelevant as it would be trespassing regardless.
If it's public property, they can't even ask you to leave, provided you are not otherwise breaking a law (for example, public intoxication).
/IANAL, etc.
But if for some reason you came into my (hypothetical) store and I had no-loaded-carry signs posted, and I asked you not to carry, if you refused and wouldn't leave then the police would be on there way and my hand on my weapon ready to draw. An armed trespasser isn't somebody to take lightly 
When you're in somebodies store I think you should treat it as if you are a guest in their home - though I think most of the time those no loaded gun signs are more for safety of negligent discharges, anyway; it's just the odds that eventually there would be an accident if everybody who brought weapons into the store and needed them looked at/serviced had to unload them.
like a mo-fo hahaha.
