Fight with a Met Museum Security Guard

I was at the Met Museum shooting as I do regularly. I took the first photo of the two Asian girls, one taking a picture of the other as the sculpture next to the girl taking the picture looked on. Next was the older couple sitting on the bench taking a beak from putting their steps in at the museum. In both cases, as in many, I wanted to capture peoples' interaction with the art at the museum and with eachother. No sooner do get get up from one knee a security guard appoaches me and asks if I was taking pictures of people without their knowledge. My answer was yes and I followed by asking her why she was asking. She simply said it's creepy and wnet on to say "I saw you take pictures of those young girls over there." "Yes I did, and did you see me take a picture of the older couple on the bench?" She answered yes. I I went on to tell her that I was not going around the museum taking pictures of young girls just photographing what I think would make a good photograph. She answers, "well you can't do that." And again I asked why not not and she again says that it was creepy. This same cycle of words went around until a man approached us and introduced himself. He went on to say that he couldn't help overhearing our conversation and that he is liscenced as a lawyer in NY and CT, then went on to tell her that I was withing every right to photograph whomever I please with or without their consent. He then walked away but not before patting me on the shoulder and telling me to keep shooting. So I looked at her and said "well there you have it. Did you understand what the lawyer expained?" She predictable said "it's still creepy." I tried using reason - and asked facetiosly, "you work here in the museum don't you?" With a smirk she asnswers "of course I do." I then asked "have you ever visited your photo galleries here?" "Yes." "Haven't you ever noticed how many pictures there are of people that were taken without their knowledge?" Her answer, "yeah but that's different. It's art." My followup, "I'll have you know that my work is included in the permanent collections of five museums and I am creating art." And guess what she says? Yup you guessed it - "IT'S CREEPY." Well all I had left to say was that I see that this is really her problem and not mine and that I was going to go about my visit at the museum and continue to photograph whomever I want...