Don't go anywhere your sidearm is not welcome. Do not give these people your money. If you were Jewish, and the sign said , "No Jews Allowed," would you conceal the fact that you are Jewish, or be so deeply offended by their policy, that you talk to a manager, and leave, and never return?
I consider my firearm as an extension of myself. If it is not welcome, then neither am I. I do not, will not, conceal, but it would be against every moral I hold dear to do so so that I can enter an anti gun establishment.
+1