What the heck?! Marlee is just like any other actor/actress out there -- the public perception of them is skewed. Sometimes they're your best friend for the day and really cool and chat it up, and other times they're the biggest, stuck up person on the planet. I know she has a nice personality and sometimes people misunderstand her as an arrogant person.
In any case, there's nothing about the photo that shows that she's being mean to anyone. There's NO WAY to know what she's saying or in the process of saying UNLESS YOU WERE THERE! She looks like she's saying "whaaa?" to someone off-camera. You can't see her thumb from this angle and you can't capture the motion of the "what" sign.
The paparazzi always get hundreds of pictures of famous people doing normal things but with the right lighting, angle, and moment, they capture them in questionable positions and sell those pictures for thousands of dollars. This looks NOT REMOTELY compromising. So, until someome who was there tells us what happened, she wasn't doing anything bad or mean or stuck up.