As far as I know it’s still legal to take pictures of anything in public view.In August I took my wife's sister and her family to JFK airport for their return flight home and I was saying goodbye to them at the security line, as they waited to approach the security gate, and I took a couple of pictures of them waving goodbye and a TSA person yelled at me to put the camera away.
Was she right to do so? I don't know. I didn't question it at the time. I put the camera away.
A property owner, or someone working on behalf of the property owner can always tell you to leave. They can make "no picture taking" a condition for staying on the property.
I would always recommend following directions, but if you think your rights have been violated, then take your grievance to a venue designed for the purpose (a call to a supervisor, an attorney, or something similar).