Next time be more discreet and respond "yes I am a technician!"
I've had lounge employees in LGA & LAX tell me not to take pictures of planes.
They turn their back and I go back to taking pictures.
This is the 21st century. Everyone has a camera.
Everyone has a 15 year *A pin. They were being given out in lounges a couple years ago.

I would definitely complain to AC. Employees need to stop lying.