Costco

I (we) go to Costco quite often.  So obviously we have the ExecutiveMembership Card.  Everytime I go to Costco, the stupid lady standing at the doors, will ask me…out of the 5 other people entering at thes ame time I am, for my card.  Do the others have their cards out, to show her? NOPE!  She specifically asks ME! Why?  I dunno, but its getting kind of annoying.  Do I not look like the type to have a membership?  Seriously!!!  You can’t purchase anything without a card (unless you’re with someone else), so whats the big deal?  Stop only asking me!!!  Thanks!