Nah. If this is true, the fan is 100% correct. This is Demi's job, and the fan paid good money to see her. She should've went above and beyond to make sure the fan had the best experience.
I met Demi at her 2012 tour and she made the same pose almost for everyone, was ready to pose with the next person by the time I was done, I asked for a hug and she said "no but we can take a picture though". No duh we're taking a picture, I bought a meet and greet lol...
She seems kind of rude in paid meet and greets, but if you catch her on the street she's really sweet.