hrm, it's not that i disagree that photographers should know their rights and push for them (the rights) whenever needed..
but the approach, and the basis should be less on the petty side, with more mutual respect. most people/guards are not doing it for no reason, they are just ignorant, there is no need to rub it in, or lord it over them just because of this ignorance.
you can either do such things in a respectful, measured way, which leaves both parties happy, since you get what you want, and the guard's backside is covered.. or you can crow, be jubilant, flounce around and even take out pom-poms and champagne to celebrate.. i know which method i would choose.
just my 2 cents.